Story Highlights• NEW: 13 people killed in four newly reported Iraq attacks, police say
• Outpost ambush kills two U.S. troops, eight Iraqi police, officials say
• Iraqi officials: Attack included three suicide car bombs, 50 gunmen
• Five U.S. military deaths reported in Anbar province since Friday
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BAGHDAD, Iraq (CNN) -- An attack by three suicide car bombers Monday near a U.S.-Iraqi outpost killed two American soldiers and eight Iraqi police officers, Iraqi officials told CNN.
The U.S. military confirmed the American deaths and said 17 U.S. troops were wounded in the "coordinated attack" north of Baghdad, but it did not reveal the strike's exact location.
Iraqi officials said the insurgents targeted Iraqi police headquarters in Tarmiya -- about 25 miles (40 kilometers) north of Baghdad -- which also houses U.S. troops.
After a series of three suicide car bombings, 50 gunmen opened fire on the outpost, the Iraqi officials said.
Insurgents fired small arms and threw grenades after an initial car bombing, a U.S. military official said.
The site, which is about 25 miles (40 kilometers) north of Baghdad, has been secured and the incident is under investigation, according to the U.S. military.
The latest deaths bring to 3,140 the number of U.S. military personnel, including seven Department of Defense civilians, killed in the Iraq war.
The ambush comes as about 112,000 U.S. and Iraqi forces continue a Baghdad security crackdown dubbed "Fardh Al-Qanoon," or "Enforcing the Law." (Watch how Iraq is doing under new crackdown )
Attackers also struck civilian targets Monday in the capital. Mortars slammed into a residential area in southern Baghdad's Dora district Monday afternoon, killing 11 people and wounding 14 others, Iraqi police said.
Earlier, a bomb exploded inside a minibus in central Baghdad, killing two people and wounding eight others, police said.
According to police, the attack took place in the Karrada district around 8:30 a.m. (12:30 a.m. ET)
About 30 minutes later, six people were killed and 40 others were wounded when a pair of roadside bombs exploded near an Iraqi police patrol in the Zafaraniya district of southeastern Baghdad, police said. Three Iraqi police were among the dead, and 10 were among the wounded, police said.
In Mahmoudiya, about 25 miles (40 kilometers) south of Baghdad, a car bomb exploded along a street, killing one person and wounding four more, police said.
Around midday, a suicide car bomber attacked an Iraqi police checkpoint north of Ramadi, wounding at least four people.
Ramadi is about 60 miles west of Baghdad in Anbar province.
Seven detained near Tikrit
Coalition forces detained seven suspected terrorists and destroyed a vehicle rigged with explosives during a raid east of Tikrit on Monday morning, a U.S. military statement said.
The raid was launched after intelligence reports "indicated a suspected terrorist with ties to the foreign fighter facilitator network was working the targeted area," the statement said.
In apprehending the targeted individual, coalition forces also detained six other suspected terrorists.
The forces also discovered a vehicle bomb on the property and destroyed it, the military said.
Tikrit is about 80 miles north of Baghdad.
CNN's Arwa Damon, Jomana Karadsheh, Barbara Starr and Mohammed Tawfeeq contributed to this report.
An Iraqi soldier directs traffic Monday at a Baghdad checkpoint amid tightened security.
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