Pakistan ? Intelligence officials and a witness say at least 15 people died in an attack involving U.S.-led forces in northwest Pakistan.

The U.S.-led coalition in Afghanistan said it had no immediate report of an incursion.

Witness Habib Khan Wazir said the incident happened after an American helicopter landed outside a home in the village of Musa Nikow in South Waziristan before dawn today.

He said the troops came out and fired on people outside and inside the house.

Two local intelligence officials confirmed the account on condition of anonymity because they were not authorized to speak to media. One official said 19 died.

Pakistan’s army said it was looking into the report. The U.S. Embassy declined comment.