Abu Ghraib

Prior to Invasion ;

The US and UK claimed that Iraq's alleged possession of weapons of mass destruction (WMD)

Post Invasion ;

After investigation following the invasion, the US-led Iraq Survey Group concluded that Iraq had ended its nuclear, chemical, and biological programs in 1991 and had no active programs at the time of the invasion.

From Daily Kos' partial transcript of a video (link to REAL stream) of Seymour Hersh speaking at an ACLU event. He says the US government has videotapes of children being raped at Abu Ghraib prison in Iraq.