A NATO helicopter crossed into Pakistani territory and opened fire on a border post on Tuesday, wounding two soldiers and drawing return fire, local officials said, and Pakistan protested, further straining relations with the West following the U.S. raid that killed Osama bin Laden.

A Western military official in Afghanistan gave a different version of events, but he and a NATO spokesman said there was firing at the border. They did not confirm that Pakistani border troops were the target or had been hit.

The official said a NATO base in Afghanistan took intermittent direct and indirect fire from the Pakistani side of the border. Two helicopters flew into the area, and one fired across the border after twice taking fire from the Pakistani side, said the official, speaking on condition of anonymity because of the sensitivity of the issue.

source: AP