An illustration from the "American Qur'an" implies that the 9/11 attacks were Allah's punishment for not accepting Islam (Sura 44:10-12).
44:10 But watch thou (O Muhammad) for the day when the sky will produce visible smoke
44:11 That will envelop the people. This will be a painful torment.
44:12 (Then they will say): Our Lord relieve us of the torment. Lo! we are believers.
Guess again.