An attempt to topple the World Trade Center in New York City fails, but six people are killed and over 1,000 injured in the misfired blast. The explosion is caused by the detonation of a truck bomb in the underground parking garage. An FBI explosives expert will later state, “If they had found the exact architectural Achilles’ heel or if the bomb had been a little bit bigger, not much more, 500 pounds more, I think it would have brought her down.” Ramzi Yousef, who has close ties to Osama bin Laden, organizes the attempt. [Village Voice, 3/30/1993; US Congress, 2/24/1998] The New York Times will report on Emad Salem, an undercover agent who will be the key government witness in the trial against Yousef. Salem will testify that the FBI knew about the attack beforehand and told him it would thwart the attack by substituting a harmless powder for the explosives. However, an FBI supervisor called off this plan and the bombing was not stopped. [New York Times, 10/28/1993] Other suspects were ineptly investigated before the bombing as early as 1990. Several of the bombers were trained by the CIA to fight in the Afghan war and the CIA will conclude, in internal documents, that it was “partly culpable” for this bombing (see January 24, 1994). [Independent, 11/1/1998] 9/11 mastermind Khalid Shaikh Mohammed is an uncle of Yousef and also has a role in the bombing (see March 20, 1993). [Independent, 6/6/2002; Los Angeles Times, 9/1/2002] One of the bombers even leaves a message, which will be found by investigators, stating, “Next time, it will be very precise.” [Associated Press, 9/30/2001]