A suspected U.S. missile strike that killed up to 13 foreign militants in Pakistan’s North Waziristan region this week had targeted second or third tier al Qaeda leaders, according to residents in the tribal area reports Reuters.

Initial reports said 10 people were killed in the attack on Monday on a house in Torkhali village near the town of Mir Ali.

An intelligence official, however, told Reuters on Thursday that based on information gleaned from tribal contacts there were seven Arabs and six Central Asians killed.

He said the attack was believed to have been carried out by a pilotless U.S. Predator aircraft flown across the nearby border with Afghanistan.

“The missile appeared to have been fired by a drone,” the intelligence official said.

The Pakistani authorities have not confirmed the attack, and the Pentagon has denied taking any action, but the Defense Department does not speak for the Central Intelligence Agency.

Read it here: U.S. missile strike in Pakistan hit al Qaeda nest