U.S. troops run across the street during a mission in Baquba

The military did not give the cause of Wednesday's crash and said the incident is under investigation.

However, an al-Qaida-linked group said in an Internet statement that its fighters clashed with U.S. aircraft along a road between Baghdad and Mosul in Nineveh province. The Islamic State of Iraq said the helicopter hit a high-voltage power line during the fighting and crashed.

Another U.S. soldier was killed during combat operations in southern Baghdad.

The U.S. military also said coalition forces have killed 35 terrorists in recent days in Iraq.

Meanwhile, Iraq's parliament delayed the start of debate on a newly revised oil revenue-sharing law following complaints from Sunni, Kurd and Shi'ite politicians.

Of Iraq's 37 Cabinet ministers, at least 12 from Sunni and Shi'ite groups currently boycotting participation in the government were absent for the vote.

The Iraqi Cabinet approved the measure on Tuesday, and the government had said parliament would begin debate on the law Wednesday.

The law is designed to fairly distribute the benefits of Iraq's oil reserves among Iraq's Kurds, Sunni Arabs and Shi'ite groups.

Iraq's oil reserves, the world's third largest, are mostly in the Kurdish north and Shi'ite dominated south. There is little oil in Iraq's central region where Sunnis are in the majority, and they fear the new distribution formula will treat them unfairly.

Some information for this report provided by AP, AFP and Reuters.

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