BAGHDAD, Iraq (CNN) -- An explosion wounded at least four Iraqi police officers Thursday while they were dismantling a bomb on a Baghdad bridge, Iraq's Interior Ministry said.
Workers clean up after a car bombing Wednesday in Baghdad.
Insurgents have targeted bridges in and around the Iraqi capital in recent months, including a suicide bombing in June that killed three U.S. soldiers and wounded six others near Mahmoudiya, south of Baghdad. That blast triggered a highway overpass to collapse on the Americans.
Also Thursday, five bodies were found dumped in Baghdad, raising the number of unidentified corpses discovered this month in the capital to 422, an Interior Ministry official said. Officials attribute such deaths to sectarian violence.
In the northern city of Kirkuk, the police chief escaped an assassination attempt Thursday, authorities said. Two roadside bombs detonated near Gen. Burhan Tayyeb's convoy in central Kirkuk. The attack wounded two members of Tayyeb's security detail, but the chief escaped unharmed.
The U.S. military reported the deaths of two American soldiers in combat -- one Thursday in western Baghdad and the other Wednesday in Diyala province.
On Thursday, a Multi-National Division-Baghdad soldier was killed and another was wounded. Soldiers from this unit have been involved in cordon and search-and-clearing operations.
On Wednesday, a U.S. soldier was killed by an explosion near his vehicle during fighting. The soldier was assigned to the Army's Task Force Lightning, which has launched raids and offensives against militants in Diyala in recent months.
The U.S. military death toll in the Iraq war stands at 3,735, including seven civilian employees of the Defense Department.
The military has reported 77 U.S. troop deaths this month to date, approaching last month's 79.
Those figures are lower than fatalities in the previous three months, when there were 100 U.S. deaths in June, 126 in May and 104 in April. E-mail to a friend
CNN's Jomana Karadsheh contributed to this report.
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