Osama Bin Laden claimed responsibility for masterminding 9/11 on the night of the attacks, his son-in-law said Wednesday as he unexpectedly testified at his federal trial in New York on terror charges. Suleiman Abu Ghaith, who married bin Laden's daughter Fatima, recounted a dramatic meeting with the jubilant Al-Qaeda chief in an Afghanistan cave complex on the night of September 11, 2001. We are the ones who did it," Bin Laden declared, according to Abu Ghaith. The 48-year-old from Kuwait told the court he warned Bin Laden that he would feel the full force of America's wrath following the attacks on New York and Washington.