(CBS News) LONDON - Two U.S. troops were killed Friday in the western Afghan province of Farah when an Afghan Local Police officer turned his gun on them in the most recent incident in a string of so-called green-on-blue attacks, which have increased dramatically during the last year.
The police officer was shot and killed, according to NATO, which said an investigation was underway.
Friday's attack in Farah marks the 30th time in 2012 that Afghan security forces working in partnership with Western troops have turned weapons on their allies. At least 39 coalition forces have been killed in green-on-blue attacks this year, according to NATO, including 23 Americans.
Taliban claims infiltration of Afghan forces
3 U.S. troops dead in 2nd "green-on-blue" attack
"Green on blue" attacks a growing problem
The police officer was shot and killed, according to NATO, which said an investigation was underway.
Friday's attack in Farah marks the 30th time in 2012 that Afghan security forces working in partnership with Western troops have turned weapons on their allies. At least 39 coalition forces have been killed in green-on-blue attacks this year, according to NATO, including 23 Americans.
Taliban claims infiltration of Afghan forces
3 U.S. troops dead in 2nd "green-on-blue" attack
"Green on blue" attacks a growing problem