KABUL, Afghanistan — A NATO airstrike hit two Afghan military checkpoints on Monday in a restive province east of the capital, Kabul, killing seven Afghan troops in what an Afghan official describes as an accident due to bad coordination. The incident happened as coalition helicopters were flying over an area in Logar province where clashes were underway between Afghan troops and Taliban fighters, the Afghan Ministry of Defense said. Insurgents fired toward the helicopters, prompting a response that destroyed one army checkpoint, the ministry statement added.