Testimony of
Christopher Kojm at Congressional hearings on 911 (pdf file in picture format so if you want the synopsis he was testifying about the TIPOFF program at the Department of State having info about two of the hijackers on August 23, but it was after working hours , so the info wasn't entered into the computer until the next day. One had arrived in the US in January of 2001, the other arrived in July.)
Christopher Kojm Testimony