BAGHDAD, June 1 (Reuters) - A U.S. helicopter crashed south of Baghdad on Sunday, injuring two soldiers, the U.S. military said.

"Preliminary indications point to a mechanical failure as the cause of the crash, but an investigation will be conducted to determine what happened," the military said in a statement.

It did not say whether anyone else was on board or identify what type of helicopter was involved in the crash.

The U.S. military in Iraq mostly uses Apache attack helicopters and Black Hawks, which are usually deployed to transport soldiers round the country.

At least 67 U.S. helicopters have crashed in Iraq since the U.S.-led March 2003 invasion, 36 of them due to enemy fire, according to the Brookings Institution's Iraq Index.

(Writing by Ross Colvin)

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