The U.S. military says five Iranians detained by U.S. forces in Iraq are linked to an Iranian Revolutionary Guard group that arms Iraqi insurgents.
A coalition statement says preliminary results from a probe into the detainees has revealed their ties to the Iranian group.
The statement says the group, Qods Force is known to provide funds, weapons, and improvised explosive device technology and training to extremist fighters trying to destabilize Iraq's government and attack coalition forces.
The five Iranians were detained Thursday during a raid on a building in the northern Iraqi city of Irbil.
Iraq says the building was an Iranian liaison office in the process of becoming a consulate. The United States says the building was raided because of information that the people there were linked to attacks against U.S. and Iraqi forces.
Separately, a U.S. congressional delegation met Saturday in Baghdad with American military commanders and Iraqi Prime Minister Nouri al-Maliki to discuss the sectarian violence in the country.
After the talks, delegation member Senator Hillary Clinton, a Democrat from New York told a U.S. television network (ABC) that the American people and U.S. Congress doubt that the mission in Iraq can work.
Clinton is traveling with fellow Democratic Senator Evan Bayh (Indiana) and Republican Congressman John McHugh (New York). Most Democrats oppose President Bush's plan to send more U.S. troops to Iraq.