Unscom, the now-defunct UN weapons inspection programme in Iraq, was "infiltrated and fatally compromised" by the American and British intelligence agencies - according to a report by the BBC's Panorama programme.
Unscom was set up after Iraq's defeat in the Gulf War of 1991 to track down and destroy Iraqi weapons of mass destruction.
Using interviews with former weapons inspectors, and with Unscom chief Richard Butler, investigative journalist Tom Mangold alleges that:
The infiltration began in 1996 when weapons inspectors grew impatient with Iraqi efforts to "lie, cheat and deceive".
American and British inspectors began to take over specific Unscom operations, thereby compromising the UN's independence.
In one case, codenamed "Operation Teacup", a team of Unscom personnel - who were in fact working for US and British intelligence - thwarted an Iraqi attempt to obtain banned material in Romania.
US intelligence agents succeeded in smuggling into Baghdad a large and sophisticated listening device known as "Stephanie". The device was kept in the office safe of American weapons inspector, Scott Ritter.