By the CNN Wire Staff
May 7, 2012 -- Updated 1347 GMT (2147 HKT) CNN.com
(CNN) -- Violence raged in Afghanistan over the last 24 hours, with reports of civilian deaths in an airstrike and soldier deaths in a bombing.
At least 14 civilians were killed and six others were injured Sunday in a coalition airstrike in Badghis province in the northwest, a senior Afghan police source said. NATO's International Security Assistance Force said an airstrike in the province killed three insurgents.
"We are aware of and are looking into the reports of civilian casualties," said Lt Col Jimmie Cummings, a spokesman for the NATO-led force.
The strike occurred in the province's Bala Murghab district, said Sharafuddin Majidi, a spokesman for the governor of Badghis province, and the police source.
In eastern Afghanistan, attackers killed three U.S. soldiers Monday, a Western official said.
The deaths occurred just south of a base in Ghazni province when an explosion hit the vehicle the soldiers were traveling in, said the official who asked to remain anonymous because he is not authorized to discuss the incident with media outlets.
Two Americans were wounded as well, the official said.
The NATO-led force reported that three service members died in the bombing.
More than 1,900 Americans and another 1,000-plus allied troops have died in the 10-year-old conflict.
On Sunday, a NATO service member was shot to death by a gunman in an Afghan army uniform in southern Afghanistan, the allied command in Kabul reported.
The attacker was killed by coalition forces who returned fire, the NATO-led force reported. An investigation was under way, it said, and no further details were immediately released.
The year has seen a number of attacks on coalition forces by Afghan forces or by insurgents who have disguised themselves as Afghan troops, fueling distrust at a critical period of the conflict.
In another attack Sunday, a roadside bomb struck a vehicle carrying U.S. troops in eastern Afghanistan, killing one American and wounding two, a Western official said. The bombing happened about 10 kilometers (6 miles) south of an outpost in Paktia province, near the Pakistani border, the official said.
CNN's Masoud Popalzai and Nick Paton Walsh in Kabul and Joe Sterling in Atlanta contributed to this report
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