KABUL — The U.S.-led military coalition in Afghanistan says three of its troops have been killed by a man in an Afghan army uniform.

The attack is the latest in a rising number of disturbing shootings this year by Afghans soldiers — or insurgents dressed as government troops — on the international forces training them to fight the Taliban as the international coalition withdraws.

NATO said Wednesday the latest attack came a day earlier in southern Afghanistan. It gave no other details.

Similar "insider attacks" have been rising sharply, with 34 of them so far this year. Forty-five coalition members have been killed, mostly Americans.

At least a dozen of this year's attacks have been in the past month, raising questions of a new Taliban strategy.