The spokesman for the Pakistani military, Major-General Shaukat Sultan, says his government has lodged a protest with the United States over an incursion into Pakistani territory by US forces operating in Afghanistan.
General Sultan said a few US troops had strayed into Pakistani territory near the Lwara Mandi area in North West Frontier Province while hunting for al-Qaeda and Taleban suspects.
He said the US troops searched a few shops and a petrol station but turned back as soon as they were informed that they were in Pakistani territory.
From the newsroom of the BBC World Service