KABUL, Afghanistan – Violence in Afghanistan fell in 2012, but more Afghan troops and police who now shoulder most of the combat were killed, according to statistics compiled by The Associated Press.

At the same time, insider killings by uniformed Afghans against their foreign allies rose dramatically, eroding confidence between the two sides at a crucial turning point in the war and when NATO troops and Afghan counterparts are in more intimate contact.

“The overall situation is improving,” said a NATO spokesman, U.S. Air Force Lt. Col. Lester T. Carroll. He singled out Afghan special forces as “surgically removing insurgent leaders from the battle space.”