BAGHDAD, Iraq (CNN) -- A car bomb struck a police checkpoint in central Ramadi Wednesday morning, killing five people, an Iraqi Interior Ministry official has said.
Elsewhere in the country, three coalition troops and an interpreter have been killed in separate incidents, the U.S. and British military announced.
And Iraqi police in Saidiya neighborhood in southwestern Baghdad found the bodies of five men dumped in a trash yard with gunshot wounds, their hands tied behind their backs and showing signs of torture.
Sixteen people were also wounded in the car bomb attack outside a courthouse in Ramadi, located west of Baghdad and once a hotspot of insurgent violence.
However, attacks have decreased since the U.S. military formed an alliance with Sunni leaders in Anbar province to fight against one of the main insurgent groups, al Qaeda in Iraq.
A U.S. soldier and an Iraqi interpreter were killed and three other Multi-National Division-Baghdad soldiers wounded when a powerful roadside bomb struck a U.S. military combat patrol in eastern Baghdad Tuesday, the U.S. military announced. It said the device was manufactured in Iran.
"The patrol was returning to base after conducting an escort mission at the time of the attack," the military news release stated.
The U.S. military maintains that explosively formed penetrators, or EFPs -- a more sophisticated and powerful type of roadside bomb -- are made in Iran and their components are shipped into Iraq by the Quds Force, the Iranian unit accused by the United States of training and arming insurgents.
With the soldier's death, 3,874 U.S. military personnel have been killed in the Iraq war. Thirty of those deaths have occurred this month.
Separately, two British service members were killed and two wounded when a RAF Puma helicopter crashed Tuesday night near Baghdad, the British Ministry of Defense said Wednesday.
Initial reports from the Multi-National Forces said 12 crew members were injured in the crash, but an MoD spokesman said only two were hurt. He attributed the discrepancy to confusion between the British and American representatives in Iraq charged with dealing with the media.
The two personnel who were hurt suffered serious injuries and were recovering in the hospital, the MoD said.
"It is too early to speculate on the cause of the crash; an RAF Board of Inquiry has already been convened and is en route to Iraq to conduct its investigations," an MoD statement said. E-mail to a friend