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The 1993 World Trade Center bombing occurred on February 26, 1993, when a car bomb was detonated below the North Tower of the World Trade Center in New York City. The 1,500 lb (680 kg) urea nitrate–hydrogen gas enhanced device[1] was intended to knock the North Tower (Tower One) into the South Tower (Tower Two), bringing both towers down and killing thousands of people.[2][3] It failed to do so, but did kill six people and injured 1,042.
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Ramzi Yousef and a Jordanian friend, Eyad Ismoil, drove a yellow Ryder van into Lower Manhattan, and pulled into the public parking garage beneath the World Trade Center around noon. Yousef ignited the 20-foot fuse, and fled. Twelve minutes later, at 12:17:37 pm, the bomb exploded in the underground garage, generating an estimated pressure of 150,000 psi.[8] The bomb opened a 30-m (98 ft) wide hole through four sublevels of concrete. The detonation velocity of this bomb was about 15,000 ft/s (4.5 km/s).