Al Qaeda's terrorist attacks on 11 September 2001 (colloquially known as 9/11) on the World Trade Center (1973–2001) in New York City and The Pentagon in Washington, D.C. made a powerful impact on doubting and former Muslims. For some, it (partially or temporarily) reversed their process of apostasy in the face of a generalised anti-Muslim backlash that (mistakenly) targeted them or their family and friends as "terrorists" in Western societies. For others, it accelerated their loss of faith, or in fact planted the first seed of doubt about their Islamic beliefs, that appeared to be based on the same religious texts that the 9/11 hijackers used to justify their terrorist attacks. Ali Sina, a Muslim convert to Christianity, founded the Faith Freedom International (FFI) website in October 2001. Meanwhile, Ibn Warraq compiled the first collection of stories from former Muslims: "Leaving Islam: Apostates Speak Out" (2003);