Pakistan officials say a bomb attack on a polio vaccination team in a village near the Afghan border has killed 12 people.
A roadside bomb went off as the police-guarded convoy drove through the village.
An official said the attack lasted an hour and when rescuers approached the scene the gunmen also attacked them.
Another official said all the casualties were members of the levies or Khasadar, both locally recruited government-backed militias. They were providing security for the health workers.
It's the latest in a series of attacks against polio teams.
No group has claimed responsibility, but the Taliban oppose the polio schemes, which they say is a cover for international espionage.
Pakistan is one of the last three countries in the world where polio remains endemic and the only one of those three where reported cases are increasing. The disease can kill or paralyse within hours.