BAGHDAD (AP) The U-S military reports seven U-S troops have been killed by roadside bombs today.

Four soldiers were killed in a single strike, when an explosion hit their vehicle during combat northwest of Baghdad.

Another roadside bombing in Tikrit (tih-KREET') killed an airman.

And two U-S soldiers were killed and three wounded when their unit was struck by a roadside bomb in Baghdad. Gunmen then opened fire on the troops in the predominantly Shiite area.

An eighth soldier died from a non-battle-related cause. The incident is being investigated.

According to an Associated Press count, at least three-thousand-five-hundred-55 members of the U-S military have died since the Iraq war started in 2003.

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