Gunmen in Afghan uniform kills NATO troop Thursday’s incident is the second green-on-blue attack this week. On Tuesday, two gunmen confirmed to have been Afghan National Army soldiers turned their weapons on NATO troops, killing a U.S. service member and wounding two others, ISAF confirmed Friday morning. The Taliban claimed responsibility for that shooting, which took place in Paktia province, eastern Afghanistan. The suspects escaped after the attack and a search was underway to track them down. In a separate attack Wednesday morning, at least one suicide bomber walked up to a group of U.S. troops on foot patrol near the provincial council office in Kunar province, also in the east, and blew himself up, killing three American troops and one civilian working for the State Department’s USAID program. There has been no indication that the bomber or bombers in this attack were wearing Afghan uniforms. The Taliban traditionally steps up attacks in August, but the militant group’s claimed success in recruiting rogue forces from the ranks of the Afghan army and police to turn on their Western allies, with whom they work and live very closely as ISAF ramps up its planned transition of security to Afghan forces, has fostered a lack of trust. While the Taliban often claim they have infiltrated the Afghan security forces and are carrying out these attacks, CBS News reporter John Bentley reported in July that a U.S. Defense Department report maintains the attacks are not carried out by insurgents. “Investigations have determined that a large majority of green-on-blue attacks are not attributable to insurgent infiltration of the ANSF (Afghan National Security Forces), but are due to isolated personal grievances against coalition personnel,” the report said.