Police say unknown attackers have killed at least seven police officers in central Pakistan.
The attack happened early Saturday near the town of Mianwali, in Punjab province. Police say militants first opened fire on a police checkpoint and then blew it up with explosives.
The outpost building was destroyed in the blast.
Security officials say it is not clear who is behind the attack.
Mianwali is near the restive North West Frontier Province, where Pakistani security forces have been battling pro-Taliban militants.
Some information for this report was provided by AFP and AP.