Fox News reports that Khalid Shaikh Mohammed has admitted responsibility for masterminding both WTC attacks amongst others. Richard Miniter at TCS has listed all the evidence in the public record that links al Qaeda to Iraq. The first WTC attack is directly linked to Saddam:

Abdul Rahman Yasin was the only member of the al Qaeda cell that detonated the 1993 World Trade Center bomb to remain at large in the Clinton years. He fled to Iraq. U.S. forces recently discovered a cache of documents in Tikrit, Saddam’s hometown, that show that Iraq gave Mr. Yasin both a house and monthly salary.

The first WTC attack is now directly linked to Al Qaeda and Saddam.