Peshawar- Gunmen attacked three container trucks carrying NATO supplies to Afghanistan through the north west of Pakistan. Two people were killed, said officials. The trucks were attacked in the Wazir Dhand area of Khyber, one of seven districts that make up thesemi-autonomous tribal belt of Pakistan, as they were on their way to Afghanistan. Pakistan is a major transit supply route for the NATO mission in the landlocked Afghanistan. "The three container trucks were on their way to Afghanistan when seven to eight gunmen opened fire at them in the Wazir Dhand area, killing two drivers and wounding two others," a senior local administration official, Ali Sher told. He said two of the drivers were missing since the incident. It was unclear if they had escaped or if the militants had kidnapped them. Another local administration official also confirmed the incident and said the attackers had fled. A doctor at the government-run agency headquarters hospital in Jamrud said two bodies and two injured were bought to the hospital. "One of the injured was in critical condition and he has been shifted to Peshawar for further treatment" he said requesting not to be named. No group has claimed responsibility. In the past, such attacks were claimed by the Taliban.