Dozens of assailants attacked NATO containers in the Wazir Dhand area of Jamrud on Monday, killing two drivers, according to media reports.
Gunmen attacked three container trucks carrying Nato supplies en route to Afghanistan, killing two people, officials said.
Two other drivers are missing and may have been kidnapped by the attackers,
It was reported that there were more than 20 assailants who fired at the Nato trucks and later set the containers on fire.