Since the September 11 attacks, DIA has been active in nuclear proliferation intelligence collection and analysis with particular interests in North Korea and Iran as well as counter-terrorism. DIA was also involved with the intelligence build-up to the invasion of Iraq in 2003 and was a subject in the Senate Report of Pre-war Intelligence on Iraq. After the invasion, DIA led the Iraq Survey Group to find the alleged Weapons of Mass Destruction. The agency has conflicted with the CIA in collection and analysis on the existence of weapons of mass destruction in Iraq and has often represented the Pentagon in the CIA–DoD intelligence rivalry due to DIA's own Clandestine HUMINT collection.