WASHINGTON — A U.S. official says two more American troops have been killed in Afghanistan, the latest in a series of attacks following protests over the burning of the Quran.

The official said details of the killings today in Southern Afghanistan are still unclear but officials believe there were three attackers, two of whom were subsequently killed. He said the third may be in custody.

The official spoke on condition of anonymity because he was not authorized to speak on the record.

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