Pakistani troops reportedly fire on US helicopters [September 22 2008]

Pakistani troops and tribesmen opened fire on two U.S. helicopters that crossed into the country from neighboring Afghanistan, intelligence officials said Monday.

The helicopters did not return fire and re-entered Afghan airspace without landing, the officials said.Pakistan's army and the U.S. military in Afghanistan said they had no information on the reported incursion late Sunday, which will likely add to tensions between Islamabad and Washington.

A spate of suspected U.S. missile strikes into Pakistan's border region and a raid by U.S. commandos said to have killed 15 people have angered and embarrassed Pakistani leaders while signaling Washington's impatience with Pakistani efforts to clear out militant havens.