A U.S. military official says American and Pakistani troops traded gunfire during a five-minute skirmish on the Afghan-Pakistan border.

A U.S. military official says American and Pakistani troops traded gunfire during a five-minute skirmish on the Afghan-Pakistan border.
The official says the exchange began when Pakistani forces fired on two American helicopters escorting Afghan and American ground troops along the volatile border.
The official says American forces responded with small-arms fire directed at the outpost, and that the Pakistani forces returned fire against the ground units.
There were no casualties reported in the exchange. The official said the helicopters were flying about a mile inside the Afghan border. The official spoke on condition of anonymity because he wasn't authorized to release the information.