In this Sunday March 10, 2013 photo, an Afghan policeman mans a checkpoint on the outskirts of Maidan Shahr, Wardak province, Afghanistan. A man in Afghan Police uniform opened fire on Afghan and NATO-led International Security Assistance Force (ISAF) troops in Wardak province on Monday, March 11, 2013, killing several U.S. and Afghan forces in what appears to be the latest in a series of insider attacks against coalition and Afghan forces. (AP Photo/Anja Niedringhaus)

Associated Press
In this Sunday March 10, 2013 photo, an Afghan policeman mans a checkpoint on the outskirts of Maidan Shahr, Wardak province, Afghanistan. A man in Afghan Police uniform opened fire on Afghan and NATO-led International Security Assistance Force (ISAF) troops in Wardak province on Monday, March 11, 2013, killing several U.S. and Afghan forces in what appears to be the latest in a series of insider attacks against coalition and Afghan forces. (AP Photo/Anja Niedringhaus)
In this Sunday March 10, 2013 photo, an Afghan policeman mans a checkpoint on the outskirts of Maidan Shahr, Wardak province, Afghanistan. A man in Afghan Police uniform opened fire on Afghan and NATO-led International Security Assistance Force (ISAF) troops in Wardak province on Monday, March 11, 2013, killing several U.S. and Afghan forces in what appears to be the latest in a series of insider attacks against coalition and Afghan forces. (AP Photo/Anja Niedringhaus)
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