I wish to express my heartfelt horror at the indiscriminate terrorist attacks committed against innocent people of the United States yesterday. While it is still not clear who carried out the attacks, it must be stated that no right thinking follower of Islam could possibly condone such an action: the Qur'an equates the murder of one innocent person with the murder of the whole of humanity. We pray for the families of all those who lost their lives in this unthinkable act of violence as well as all those injured; I hope to reflect the feelings of all Muslims and people around the world whose sympathies go out to the victims at this sorrowful moment.

Statement on his website (12 September 2001), quoted in "Cat Stevens Condemns Attack" in Rolling Stone (17 September 2001)