On March 10, Nidal Ayyad is arrested for a role in the February 1993 World Trade Center bombing (see February 26, 1993). Investigators soon discover a letter threatening future attacks in a computer file that was deleted but recovered. It makes reference to an earlier letter sent by Ayyad to the New York Times taking credit for the bombing (see March 2, 1993), and says: “We are the Liberation Army Fifth Battalion again. Unfortunately, our calculations were not very accurate this time. However, we promise you that next time it will be very precise and WTC will continue to be one our targets in the US unless our demands are met.” The letter is signed by the same long Arabic alias used in Ayyad’s previous letter. [New York Times, 12/15/1993]