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1993 World Trade Center bombing

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On February 26, 1993, Ramzi Yousef and his collaborators carried out a van bomb explosion beneath the North Tower of New York City's World Trade Center. The device, enhanced with urea nitrate and hydrogen gas, was intended to bring down the North Tower onto the South Tower, potentially resulting in catastrophic loss of life. Although the collapse did not occur, the blast caused six fatalities—including a pregnant woman—and injured more than 1,000 individuals. That day, roughly 50,000 people were evacuated from the area.

The terrorist plot involved individuals such as Yousef, Ahmed Ajaj, Mahmud Abouhalima, Mohammed A. Salameh, Eyad Ismoil, Nidal Ayyad, and Abdul Rahman Yasin. In March 1994, Ajaj, Abouhalima, Ayyad, and Salameh were found guilty on charges related to conspiracy and explosives offenses. Later, in November 1997, Yousef and Ismoil also faced convictions.

Emad Salem, an FBI informant who played a crucial role during the trial, disclosed that the bomb was constructed under FBI oversight. Salem recorded discussions with FBI agents indicating that a supervisory official refused a proposal to use inert powder as a decoy to convince the conspirators they possessed genuine explosives.

Planning and organization

Yousef entered the United States illegally on September 1, 1992, arriving from Pakistan alongside Ahmed Ajaj, although both presented themselves as traveling separately. Ajaj attempted to enter using a counterfeit Swedish passport, which aroused suspicion at John F. Kennedy International Airport. During further inspection, authorities discovered bomb-making instructions and related documents in his luggage, leading to his detention. The manuals referenced "Abu Barra," an alias for Mohammed Jamal Khalifa. Meanwhile, Yousef gained entry using a fraudulent Iraqi passport under the pretense of seeking political asylum and was scheduled for a hearing.

Settling in Jersey City, New Jersey, Yousef traveled throughout New York and New Jersey while establishing contact with Sheikh Omar Abdel-Rahman, a divisive blind Muslim cleric. Abdel Rahman introduced him to fellow conspirators at the Al-Farooq Mosque in Brooklyn. Thereafter, Yousef began assembling a device combining urea nitrate and hydrogen gas aimed at attacking the World Trade Center. He continued ordering necessary chemicals even while recuperating from injuries sustained in a motor vehicle accident caused by Salameh.

El Sayyid Nosair, associated with Abdel Rahman, was apprehended in 1991 for the assassination of Rabbi Meir Kahane. Prosecutors connected Nosair’s .357 caliber revolver used in that shooting to firearm purchases made by "the Red" Mahmud Abouhalima, who was also convicted for involvement in the bombing plot. Although initially acquitted of murder charges but convicted on weapons violations, Nosair was subsequently convicted in federal court. Investigators discovered Arabic-language bomb-making manuals—including some originating from the Army Special Warfare Center at Fort Bragg, North Carolina—classified memos associated with the Joint Chiefs of Staff, and 1,440 rounds of ammunition at his residence in New Jersey.

Trial records indicate that Yousef’s objective was to cause Tower 1 to collapse onto Tower 2 with the intent of killing an estimated 250,000 people as retaliation for U.S. support of Israel against Palestine.

According to journalist Steve Coll, prior to the bombing Yousef sent letters to New York newspapers claiming affiliation with the "Liberation Army, Fifth Battalion." These letters demanded cessation of all American aid and diplomatic ties with Israel and insisted that U.S. interference in Middle Eastern matters must end. He cautioned that the World Trade Center bombing was merely an initial strike should these demands remain unmet. Notably, Yousef refrained from providing religious justification and avoided clear answers when questioned about his faith beliefs.

Attack

On February 26, 1993, Ramzi Yousef and Eyad Ismoil arrived in Lower Manhattan driving a yellow Ford Econoline Ryder van, which they parked on the B-2 underground level of the World Trade Center garage. Yousef lit a 20-foot fuse and quickly fled the scene. Approximately twelve minutes later, at 12:18 p.m., the bomb detonated, producing an estimated pressure of 150,000 psi.[1] The explosion tore a 100-foot-wide breach through four concrete sublevels, with a detonation speed near 15,000 ft/s. Early accounts incorrectly attributed the blast to a transformer malfunction.

The device cut the primary electrical power supply, disabling emergency lights and allowing dense smoke to infiltrate stairwells and elevator shafts up to the 93rd floor in both towers.[2] The thick smoke hindered evacuation efforts and caused numerous cases of smoke inhalation. Power failure trapped hundreds inside elevators, including seventeen kindergarten students stuck between the 35th and 36th floors for five hours.[3]

The attack resulted in six fatalities—five Port Authority staff members (one pregnant) and a businessman whose vehicle was in the garage. Over one thousand individuals sustained injuries, predominantly during evacuation.[4] According to the US Fire Administration, police helicopters airlifted twenty-eight people with medical emergencies.[5] Injuries ranged from traumatic wounds to cardiac conditions; among those hospitalized were one firefighter along with dozens of police officers and EMS personnel.

The power outage also disrupted over-the-air broadcasts for most New York City radio and television stations for nearly a week; WCBS-TV (channel 2) was the sole station to remain on air. Cable and satellite transmissions continued via microwave links connecting major providers such as Cablevision, Comcast, and Time Warner Cable. Telephone services in Lower Manhattan were similarly affected.

Yousef aimed to bring down the North Tower onto the South Tower by detonating near its foundation; however, despite extensive damage to the garage area, both towers remained standing.[6] Hours after the bombing, Yousef fled to Pakistan.

Bomb's characteristics

Early estimates equated the blast's force to 200–300 pounds of plastic explosive Semtex. Nevertheless, Semtex was reportedly only utilized as a detonator charge, and its origin remains uncertain since it is not a homemade substance.

The FBI reported that Iraqi bomb maker Abdul Rahman Yasin assisted Yousef in constructing the sophisticated device. The primary explosive consisted of urea nitrate encased by aluminum, magnesium, and ferric oxide particles. Booster charges incorporated nitroglycerine, ammonium nitrate dynamite, and smokeless powder. Surrounding the main charge were three cylinders of bottled hydrogen, designed to amplify the fireball and afterburn effect. This approach using compressed gas tanks parallels the 1983 Beirut barracks bombing, both employing fuel-air or thermobaric bomb methods that unleash greater energy than standard explosives.

Testimonies revealed that before this incident, FBI encounters with urea nitrate-based bombs were rare. FBI agent Frederic Whitehurst criticized the procedures used to identify urea nitrate in this bomb, citing significant flaws in testing protocols.

The Ryder van had a cargo area of , capable of carrying up to of explosives; however, it was not loaded to full capacity. Yousef employed four fuses wrapped in surgical tubing, set to ignite twelve minutes after lighting via a cigarette lighter.

Yousef intended for smoke to permeate the tower interiors gradually suffocating occupants.

Contrary to common belief and Judge Duffy’s sentencing comments implying cyanide presence, senior FBI official Robert Blitzer confirmed no forensic evidence supported sodium cyanide at the scene. According to Peter Lance’s 1000 Years for Revenge, Yousef only contemplated including cyanide but later regretted not doing so.

Victims

The bombing claimed the lives of six individuals:

  • John DiGiovanni, 45, a salesperson specializing in dental products.
  • Robert "Bob" Kirkpatrick, 61, Senior Structural Maintenance Supervisor.
  • Stephen Knapp, 47, Chief Maintenance Supervisor for the Mechanical Section.
  • Bill Macko, 57, General Maintenance Supervisor in the Mechanical Section.
  • Wilfredo Mercado, 37, receiving agent at the Windows on the World restaurant.
  • Monica Rodríguez Smith, 35, a secretary who was seven months pregnant.

At the moment of the explosion, Smith was reviewing time sheets in her office on level B-2; Kirkpatrick, Knapp, and Macko were taking lunch in a nearby break area; Mercado was managing deliveries for the restaurant; and DiGiovanni was parking his vehicle in the underground garage.

Memorial fountain

A granite fountain commemorating the victims was crafted by Elyn Zimmerman and unveiled on May 25, 1995, within Austin J. Tobin Plaza, directly above where the bomb detonated. The monument displayed the names of all six victims and featured an inscription in both English and Spanish honoring the February 26, 1993 attack.

This fountain was destroyed during the events of the September 11 attacks. A recovered fragment inscribed with "John D" (representing John DiGiovanni) was incorporated into a temporary memorial designed by Port Authority architect Jacqueline Hanley on the Liberty Street side of the site. While visible behind fencing, this memorial was not accessible to visitors. The remainder of the fountain was never recovered and was removed along with other Ground Zero debris.

Post-9/11 memorials

At the 9/11 Memorial, which opened on the tenth anniversary of the 2001 attacks, those killed in the 1993 bombing are honored at the North Pool on Panel N-73.[7] A portion of the original memorial fountain is displayed inside the museum alongside other artifacts from the bombing.

The Postcards memorial in Staten Island includes Stephen Knapp, who was the only victim from that borough.[8]

Investigations

Initially, there was confusion regarding the blast's origin—some believed it to be a transformer malfunction—but this theory was swiftly dismissed by agents from ATF, FBI, and NYPD who determined that the explosion's force far exceeded that of a transformer failure. Approximately 300 FBI agents were assigned to the investigation under the codename TRADEBOM.[9]

Crucial evidence consisted of fragments from vehicle parts containing a vehicle identification number (VIN), which led investigators to identify a Ryder rental van from DIB Leasing in Jersey City as the bomb delivery vehicle. This van had been rented by Mohammed A. Salameh, a conspirator who later reported it stolen and was apprehended when he attempted to recover his rental deposit on March 4, 1993.[10]

Salameh’s arrest directed authorities to Abdul Rahman Yasin’s apartment in Jersey City, where he lived with his mother near Ramzi Yousef’s residence. Yasin was briefly detained but subsequently released and fled to Iraq. He was indicted for involvement in the attack and placed on the FBI Most Wanted Terrorists list in 2001 but vanished prior to the U.S. invasion of Iraq in 2003.

Following this lead, investigators searched Ramzi Yousef’s apartment and discovered bomb-making materials along with a business card linking to Mohammed Jamal Khalifa. Khalifa was arrested in 1994 and deported to Jordan in 1995; he was later acquitted by Jordanian courts and lived freely in Saudi Arabia until his death in 2007.[11]

In 2002 it came to light that Yasin had been imprisoned near Baghdad since 1994 but had never faced formal conviction by U.S. authorities.[12] Journalist Lesley Stahl conducted an interview with him for 60 Minutes in May 2002; since then he has neither been seen nor heard from and was not located during the 2003 Iraq invasion.

Trial and Sentencing

In March 1994, Salameh, Nidal Ayyad, Mahmud Abouhalima, and Ahmad Ajaj were found guilty in connection with the World Trade Center bombing. By May 1994, they were collectively sentenced to a total of 240 years behind bars, a term that was subsequently reduced, potentially allowing for their release when they reach their 90s or 100s.

Reopening and Expenses

The South Tower welcomed tenants back on March 18, 1993, followed by the World Trade Center Observation Deck reopening on April 17, 1993. The North Tower remained shuttered until April 1, 1993. Restoration expenses for both towers were projected at $250 million. The Vista International Hotel located at 3 World Trade Center resumed operations on November 1, 1994, after undergoing $65 million in refurbishments. The concourse level reopened its doors on March 27, 1993; meanwhile, the parking garage partially resumed service on September 1, 1993, initially restricted to government vehicles. Commercial occupants returned by spring of 1994. Enhanced security protocols included vehicle identification tags, surveillance systems, and automated gate controls.

Although the Windows on the World restaurant on the North Tower’s 107th floor sustained no structural damage, disruptions in supporting infrastructure necessitated its closure. The Port Authority engaged original designer Joseph Baum to oversee renovations costing $25 million, delaying its reopening until June 26, 1996. The adjoining Cellar in the Sky restaurant reopened shortly after Labor Day that year.

FBI Involvement

During court proceedings, it was revealed that the FBI had an informant—former Egyptian army officer Emad Salem—who alleged FBI participation in constructing the bomb. Salem secretly recorded hundreds of hours of conversations with FBI handlers. Federal officials denied these claims, and the New York Times observed that the recordings did not clarify how much federal authorities knew about a plot targeting the World Trade Center; rather, they only confirmed discussions about some form of bombing.

U.S. Diplomatic Security Service Role

While the FBI received public recognition, it was agents from the Diplomatic Security Service (DSS) who ultimately located and apprehended Ramzi Ahmed Yousef, identified as the mastermind behind the 1993 bombing of the World Trade Center. Special Agents Bill Miller and Jeff Riner arrested Yousef following a tip from an associate and through coordination with Pakistan’s Inter-Services Intelligence (ISI). Upon capture, Yousef reportedly warned investigators that "this is only the beginning."

Allegations of Iraqi Involvement

In a 2001 interview with PBS, former CIA Director James Woolsey asserted that Ramzi Yousef had connections to Iraqi intelligence and suggested that pertinent evidence had been disregarded by the Justice Department. Nevertheless, FBI lead investigator Neil Herman concluded after extensive investigations that no links existed between Iraq and the attack. CNN terrorism correspondent Peter L. Bergen summarized that multiple agencies—including the FBI, CIA, and State Department—found no proof implicating Iraq in the 1993 bombing.

Claims attributing Iraqi involvement largely originate from Dr. Laurie Mylroie of the American Enterprise Institute, but her theories have faced widespread rejection. Bergen described her allegations as baseless, noting her tendency to attribute numerous terrorist acts without evidence to Saddam Hussein. Daniel Benjamin from the Center for Strategic and International Studies confirmed that assessments by both CIA and FBI categorically refute Mylroie’s hypotheses.

A Pentagon study released in 2008 analyzing captured Iraqi documents uncovered no direct connections between Saddam Hussein’s regime and al Qaeda or any involvement in the 1993 attack. Among these materials was an audio recording of Saddam Hussein speculating about alternative perpetrators while expressing mistrust toward bomber Yasin, who was detained in Iraq at the time. Mylroie dismissed this recording as an attempt at concealment rather than evidence negating Iraqi involvement.

Enhanced security measures

In the aftermath of the 1993 bombing and the ensuing evacuation, the World Trade Center and its occupants revamped their emergency response strategies, placing particular emphasis on procedures for evacuating the towers. The New York Port Authority assumed primary oversight of the facility's security operations. Before reaching their destinations, packages were subjected to screening at several security checkpoints. These precautions played a significant role during the evacuation process amid the September 11 attacks, which ultimately led to the towers' destruction.

Access to the rooftops—previously utilized for police helicopter evacuations in 1993—was curtailed soon after the incident.

Overshadowed by the September 11 attacks

Though the 1993 bombing established the World Trade Center as a known terrorist target, it has frequently been labeled "forgotten" following the events of September 11 attacks. FBI Special Agent John O'Neill foresaw a potential future assault as early as 1995, a perspective echoed by warnings from Senators Gary Hart and Warren Rudman of the Hart-Rudman Commission in 2001. Despite these alerts, U.S. intelligence and law enforcement agencies largely failed to anticipate the 9/11 attacks. While families of those lost on 9/11 received compensation through the September 11th Victim Compensation Fund, victims of the 1993 bombing were not granted comparable reparations.

Legal accountability

Survivors and families affected by the 1993 World Trade Center bombings initiated lawsuits against the Port Authority of New York and New Jersey seeking damages. A 2005 ruling apportioned responsibility at 68% to the Port Authority and 32% to the terrorists involved. The Port Authority contested this verdict in January 2008, describing it as "bizarre," but in April of that year, a New York State Appeals Court affirmed the decision. According to New York statutes, a party found over 50% liable may be held fully financially responsible.

Nonetheless, on September 22, 2011, a split decision (4-3) by the New York Court of Appeals dismissed negligence claims against the Port Authority related to the bombing.

The dispute revolves around New York’s tort-reform apportionment statute, which permits comparison between intentional misconduct and negligence—a judicial approach typically avoided. The Restatement Third of Torts: Apportionment of Liability advises against such comparisons. When courts do engage in this practice, they often uphold jury determinations even if negligent defendants bear greater fault than those committing intentional acts, as demonstrated in this case.

See also

General sources


External links

  1. ↑ Reeve (1999), p. 10.
  2. ↑ Barbanel, Josh, The New York Times, February 27, 1993
  3. ↑ Mathews, Tom, Newsweek, March 8, 1993
  4. ↑ Reeve (1999), p. 15.
  5. ↑ US Fire Administration
  6. ↑ MSNBC (2003)
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