Alternative theories have been proposed regarding the Oklahoma City bombing. These theories reject all, or part of, the official government report. Some of these theories focus on the possibility of additional co-conspirators that were never indicted or additional explosives planted inside the Murrah Federal building. Other theories allege that government employees and officials, including US President Bill Clinton, knew of the impending bombing and intentionally failed to act on that knowledge. Further theories allege that the bombing was perpetrated by government forces to frame and stigmatize the militia movement, which had grown following the controversial federal handlings of the Ruby Ridge and Waco incidents, and regain public support. Government investigations have been opened at various times to look into the theories.