Before 9/11: Bomb Exploded Under the World Trade Center in 1993

The 1993 World Trade Center bombing occurred on February 26, 1993, when terrorists detonated a massive truck bomb in the underground parking garage beneath the North Tower in New York City. The attack killed six people, including a pregnant woman, injured over 1,000 others, and forced the evacuation of roughly 50,000 workers from the complex.

Mastermind Ramzi Yousef packed a rented Ryder van with roughly 1,200 to 1,500 pounds of urea nitrate explosives enhanced with hydrogen gas. His goal was to compromise the North Tower’s foundation so violently that it would collapse into the South Tower, potentially killing up to 250,000 civilians.

The explosion detonated at 12:18 p.m., tearing a crater roughly 100 to 150 feet wide and several stories deep into the basement parking structure. While the structural integrity of the buildings held, heavy smoke rushed up the elevator shafts and stairwells, trapping thousands in darkness during a grueling multi-hour rescue effort. The six casualties were local workers and Port Authority employees: John DiGiovanni, Robert Kirkpatrick, Stephen Knapp, Wilfredo Mercado, Monica Rodriguez Smith (who was pregnant), and William Macko. They are honored at the 9/11 Memorial & Museum.

Investigators sifted through thousands of tons of rubble to locate a blown-apart piece of wreckage containing a vehicle identification number (VIN). The VIN was traced to a van reported stolen by Mohammed Salameh. The FBI arrested Salameh when he foolishly returned to a Jersey City rental agency to try and reclaim his $400 cash rental deposit. Ramzi Yousef fled the country but was tracked down by federal agents in Islamabad, Pakistan, in 1995. Yousef and five other co-conspirators, including the van driver Eyad Ismoil, Mahmud Abouhalima, Ahmad Ajaj, Nidal Ayyad, and Mohammed Salameh, were captured, convicted, and sentenced to life in prison. One suspect, Abdul Rahman Yasin, remains at large.

The 1993 bombing serves as a historic precursor to the catastrophic attacks of September 11, 2001. Ramzi Yousef's uncle, Khalid Sheikh Mohammed, would later become the principal architect of the 9/11 attacks, executing his nephew’s original objective of bringing down the Twin Towers using commercial airplanes instead of a truck bomb.