After the attacks Osama bin Laden seemed to reinforce the belief that Al-Qaeda had been behind 9/11 and other acts of violence.
He went on to claim that Al-Qaeda was solely responsible for 9/11.
In November 2002, Osama bin Laden's "Letter to America” stated that Al-Qaeda's motives for their attacks in the USA and elsewhere included:
Further evidence of bin Laden's involvement with 9/11 emerged in 2004 when he released a video in which he explained his dealings with lead hijacker Mohammed Atta.
In 2004 and 2010, Osama bin Laden again repeated the connection between the September 11 attacks and the U.S. support of Israel.