Afghan in uniform kills three Nato contractors, including 2 Americans

A man in an Afghan security force uniform on Sunday shot and killed three civilian contractors who were working with the U.S.-led military coalition as trainers, Nato and Afghan officials said...

ISAF did not identify the nationality of the deceased, but an Afghan official who spoke to reporters on condition of anonymity said that two Americans had been killed in the attack and they had been shot by an Afghan man in a police uniform in a military training facility.

Update: Some sources are reporting that 3 Americans were killed in the attack.

Insider attacks by the U.S. military and NATO's supposed Afghan allies have escalated dramatically since President Obama took office in 2009.

Already in the first 7 and a half months of this year, at least 26 coalition service members and 3 civilian contractors - working with the U.S.-led military coalition as trainers - have been killed by their purported Afghan allies. 35 coalition troops were killed by their so-called Afghan partners over a 12-month span last year; 20 were killed the previous year; 4 were killed in the years 2007 and 2008 combined.

The latest attack dealt yet another blow to President Obama's plans to hand over Afghanistan's security to the Afghan security forces by the middle of 2013; the U.S.-led military coalition is supposed to be working closely with the Afghan forces to train and mentor them.