Islamabad, Pakistan ? Suspected U.S. military fire struck the tent of a nomad family on the Pakistan side of the rugged border with Afghanistan, killing two women and injuring at least four children, two Pakistani officials said.

The Pakistani officials said four rockets or shells were apparently fired by the U.S. military in fighting with suspected militants in Afghanistan’s eastern Khost province late Saturday, and one hit the nomads’ tent at Bangi Dar, in Pakistan’s North Waziristan tribal area.

The officials spoke on condition of anonymity as they were not authorized to speak to media. There was no immediate confirmation from the Pakistan government or military.

In Kabul, Lt. Mike Cody, a spokesman for the U.S. military in Afghanistan, said a security post along the border in Khost was attacked from the Pakistani side Saturday afternoon, and the U.S. military, coordinating with the Pakistani military, returned fire.