Peshawar, Pakistan ? Container trucks and oil tankers bound for U.S and NATO troops in Afghanistan have suspended deliveries after militant attacks prompted Pakistan to block a major supply line, highlighting the vulnerability of the mountain passage.

The ban in northwest Pakistan, confirmed on Sunday, was intended to allow for a review of security in the famed Khyber Pass. The convoys currently have little to no security detail as they travel to Afghanistan with vital food, fuel and other goods.

The suspension could be lifted as early as today with new procedures in place, said Bakhtiar Khan, a No. 2 government representative in the area.

Al-Qaida and Taliban fighters are behind much of the escalating violence along the lengthy, porous Afghan-Pakistan border. Both Afghanistan and Pakistan have accused each other of not doing enough to stop militant activity, while U.S. missile strikes in Pakistani territory have ratcheted up tensions further.

Last Monday, dozens of suspected Taliban militants hijacked several trucks near the Khyber Pass whose load included Humvees heading to the U.S.-led coalition. Over the weekend, U.S.-led coalition troops reported killing 38 insurgents in fighting in southern Afghanistan and detaining two militant leaders near Pakistan’s lawless border.

U.S. and NATO officials in Afghanistan have sought to downplay threats posed to the convoys coming through Pakistan, but NATO has said it is close to striking pacts with Central Asian countries that would let it transport “non-lethal” supplies from north of Afghanistan.

In April, NATO concluded a transit agreement with Russia, but it will be of practical use only once the Central Asian nations between Russia and Afghanistan come on board.

A Pakistani official who requested anonymity because he was not authorized to speak to the media said authorities planned to offer paramilitary Frontier Corps escorts to trucks carrying supplies for troops in Afghanistan. He did not say when this would happen.

“The suspension was made to review the security arrangements and that has already been done,” Khan said. “Along with increasing the security and establishing more checkpoints, we have issued orders to deal with attackers and snatchers more strictly.”