ISLAMABAD , Pakistan ( CNN ) -- Eight police personnel were killed in an early-morning attack Saturday on a police security checkpoint in Pakistan 's Punjab province , a police official said . The attack happened at 3:30 a.m. Saturday ( 2230 GMT Friday ) . Some personnel were asleep in the checkpost guard quarters and others were standing guard when unknown militants attacked the checkpost from their vehicle , a police official from the Mianwali district of the province said . All the men were killed by gunfire . The attackers then blew up the checkpost with explosives , the police official said . The checkpoint was part of the NATO supply routes transporting goods from the port city of Karachi through Pakistan 's northwestern region and tribal areas into Afghanistan . Police told CNN that an attack a few days ago also targeted a checkpoint in the Mianwali district . Rocket fire damaged the top level of building but no one was killed in the attack .
Early-morning attack results in death of eight police personnel . All men killed by gunfire -- attackers then blew up checkpost with explosives . The checkpoint was part of the NATO supply routes .