How many hijackers were there in the September 11 attacks?
Hijackers in the September 11 attacks
{'answer_start': array([47]), 'answer_text': array(['19'], dtype=object)}
The hijackers in the September 11 attacks were 19 men affiliated with al-Qaeda. 15 of the 19 were citizens of Saudi Arabia, and the others were from the United Arab Emirates (2), Egypt, and Lebanon.[1] The hijackers were organized into four teams, each led by a pilot-trained hijacker with three or four "muscle hijackers," who were trained to help subdue the pilots, passengers, and crew.