Pakistani intelligence officials are blaming a suspected U.S. missile strike for killing up to 13 foreign militants in the country's volatile North Waziristan region this week.
The officials, speaking on the condition of anonymity, say at least one drone aircraft similar to those used by U.S. forces in Afghanistan, was believed to have been involved in the attack.
They say seven Arabs and six Central Asians were killed in the strike which took place late Monday.
Neither the Pentagon nor the Pakistani military has confirmed the attack.
In other news, the Pakistani air force says a bomb exploded near a military truck in the town of Akora Khattak Thursday, but no one was injured.
The air force said the truck was carrying three people and suffered slight damage.
Also today, police in Quetta say a bomb exploded at a bicycle stand outside a court, wounding three people.
Violence has spread in Pakistan's tribal area near the Afghan border in recent months. The region is believed to be a sanctuary for al-Qaida and Taliban militants.
Some information for this report was provided by AFP and Reuters.