KABUL, Afghanistan, July 18 (AP/UNB) - Afghan officials say a magnetic bomb placed on a truck exploded and destroyed 22 NATO supply vehicles in northern Afghanistan.

Ghulam Sakhi Baghlani, deputy governor of Samangan province, says many of the fuel tankers and semi-trailers caught fire after the bomb went off around 2 a.m. Wednesday.

All the trucks were parked in the Rabatak area of the province where the truckers had stopped to rest. The tankers in the convoy were transporting fuel south into Afghanistan from neighboring Uzbekistan to the north.

Earlier this week, three NATO supply trucks were destroyed by militants in Sayd Abad district of Wardak province, south of Kabul.

Pakistan recently reopened its border crossings after blocking NATO supply trucks for seven months in retaliation for U.S. airstrikes that killed 24 Pakistani soldiers.