The Haqqani network of militants based in Pakistan was responsible for a weekend attack on a military outpost in Afghanistan that killed two Afghan civilians and injured 77 Americans, according to the Pentagon.

“There is a very strong likelihood that top Haqqani leadership supported and were aware of the attack,” spokesman George Little told reporters at the Pentagon today.

The U.S. has been asking Pakistan to crack down on the network, which conducts attacks in Afghanistan.

“This was not some guy with a suicide vest,” said Navy Captain John Kirby, a spokesman for Admiral Mike Mullen, the chairman of the Joint Chiefs of Staff. “This was a large, large vehicle with a large amount of explosive material, and you don’t conduct that kind of attack without good resourcing, good planning and a fair level of coordination.”

The driver of the truck, which was carrying firewood to cloak the bomb, detonated the explosives about 5:30 p.m. local time on Sept. 10 at the entrance to a coalition outpost in Sayed Abad, in Wardak Province west of the capital, Kabul.

The coalition put the number of Afghan civilians injured at fewer than 25. None of the injuries to American personnel at the outpost was life threatening, the coalition said.

“Most of the force of the explosion was absorbed by the protective barrier at the outpost entrance,” the coalition said in a Sept. 11 statement. “The impact to the compound is readily repairable and operations are continuing.”