Police raid
Yousef then returned to Manila, where he began preparing at least a dozen bombs, each with more explosive materials. Weeks before his planned attacks, a fire started in his Manila flat, forcing him to flee the room, leaving everything behind. The fire made the apartment staff suspicious, and soon police, led by Aida Fariscal, raided the flat and uncovered the plot. A Philippine National Police raid in another Manila apartment revealed related evidence that Abdul Murad, Khalid Sheikh Mohammed, and Yousef had drawn up plans for flying an airplane into CIA headquarters. The information was passed on to the Federal Aviation Administration, who warned individual airlines.