Given the task definition and input, reply with output. In this task you're given a question and you have to paraphrase the question to create the output question while retaining the meaning of the original question.

Did the 9/11 hijackers know they were going to collapse the Twin Towers or just cause moderate damage?
9/11 (terrorist attack): Would the people on the upper floors of the World Trade Centre have eventually been rescued if the towers didn't collapse?