Via BBC:

A bomb attack on a polio vaccination team in north-west Pakistan has killed at least 11 people, officials say

A roadside bomb went off as the police-guarded convoy drove through a village in Khyber Pakhtunkhwa province near the Afghan border.

The attack is the latest in a series targeting polio teams in the country.

No group has claimed responsibility, but the Taliban oppose the polio schemes, which they see as a cover for international espionage.

Initial reports said the convoy was struck by two separate bombs on Saturday.

The blasts were reportedly followed by a fierce gun battle between security forces and the militants.

Officials confirmed that people wounded in the attack were taken to a nearby hospital. Some of those injured are said to be in a critical condition.

Pakistan has witnessed a campaign of violence against health workers, who militants also accuse of being part of a Western plot to sterilise Muslims.