After the invasion, despite an exhaustive search led by the Iraq Survey Group involving a more than 1,400 member team, no evidence of Iraqi weapons programs was found. On the contrary, the investigation concluded that Iraq had destroyed all major stockpiles of weapons of mass destructions and ceased production in 1991 when sanctions were imposed. The failure to find evidence of Iraqi weapons programs following the invasion led to considerable controversy in the United States and worldwide, including claims by critics of the war that the Bush and Blair Administrations deliberately manipulated and misused intelligence to push for an invasion.