Story Highlights• 104 U.S. troops have been killed in April
• April is sixth deadliest month of war
• Bodies of 10 kidnapped fuel truck drivers found dumped north of Baghdad
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BAGHDAD, Iraq (CNN) -- Fourteen U.S. soldiers and Marines were killed in Iraq during the past 72 hours, making April the sixth deadliest month of the Iraq war, according to the U.S. military.
A U.S. Marine was killed Sunday during combat operations in Anbar province, west of Baghdad, the military said Monday.
On Sunday, three soldiers were killed and another was wounded when a roadside bomb hit their vehicle during a combat patrol. An Iraqi interpreter also was killed in the attack.
On Saturday, five U.S. soldiers were killed in and around Baghdad.
A soldier died when his combat patrol was sprayed with small-arms fire. Three soldiers died and another was wounded when a roadside bomb struck their patrol southeast of Baghdad.
A fifth soldier died and two others were wounded in another roadside bombing south of Baghdad.
On Friday, three soldiers and the two Marines were killed during combat operations in Anbar province.
The number of U.S. military personnel killed in the Iraq war stands at 3,351, including seven Defense Department civilians. April is the sixth deadliest month of the war, with 104 U.S. fatalities.
It is the highest monthly death toll for the U.S. military since December.
Bodies of truck drivers found
The bodies of 10 fuel truck drivers were found dumped near Baiji, north of the capital, on Monday, a day after they and six others were kidnapped, Baiji police said.
The fate of the remaining six is unclear.
On Sunday morning, a group of gunmen traveling in 30 vehicles attacked the convoy of fuel tankers outside Samarra -- south of Baiji -- setting fire to the trucks before kidnapping the drivers, a Tikrit police official said.
The fuel tankers were heading from the Baiji oil refinery -- Iraq's largest -- to Ramadi, in Anbar province, the police official said.
Baiji oil workers are common targets for insurgent attacks. On Saturday, the head of security for the Baiji oil refinery and his driver were kidnapped as they were driving to work, Kirkuk police said.
Baiji is about 93 miles (150 kilometers) north of Baghdad in Salaheddin province.
Also Monday, Baghdad police reported the following violence:
CNN's Jomana Karadsheh contributed to this report.
A U.S. soldier patrols a Baghdad street Sunday.