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BAGHDAD, May 25 (Reuters) - Five U.S. soldiers were killed in four separate attacks across Iraq on Thursday, most of them by roadside bombs, the U.S. military said on Friday.

The U.S. military also reported the death of another soldier on Tuesday in a roadside bomb attack near Tikrit, 175 km (110 miles) north of Baghdad.

May is on track to be one of the bloodiest months for the U.S. military since the invasion to topple Saddam Hussein in 2003, with more than 90 killed so far.

April was the worst month this year for the U.S. military, when 104 soldiers were killed.

The total death toll for the U.S. military since the invasion now stands at 3,440.

In the worst attack on Thursday, two soldiers died when their patrol was hit by a roadside bomb in western Baghdad. An Iraqi interpreter was also killed and another U.S. soldier was wounded, the military said in a statement.

Another soldier was killed by a roadside bomb near Tikrit in Nineveh province, with two others wounded in the same attack.

The military had earlier reported the deaths of one soldier from small arms fire in volatile Diyala province north of Baghdad and another from a roadside bomb in Salah Ad Din province.

The U.S. military has said it anticipated it would suffer more casualties when it launched a security crackdown three months ago, pouring thousands of extra troops into Baghdad and other areas.

The crackdown is seen as a last-ditch attempt to drag Iraq back from the brink of all-out sectarian civil war between majority Shi'ites and Sunni Arabs who were dominant under Saddam.

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