Gunmen have shot dead at least two policemen providing security to a team of polio workers in north-west Pakistan. A polio worker was also killed in a separate attack, local media have reported.
The two policemen were travelling from the town of Swabi to Topi by motorbike when they were attacked.
The polio worker was shot on the outskirts of Peshawar.
The attacks are the latest in a series targeting polio teams in the country.
No group has claimed responsibility for the attack, but the Taliban oppose the polio vaccination schemes, which they see as a cover for international espionage.
Islamist militants have been at the forefront of a decade-long campaign of violence against health workers, who they also accuse of being part of a Western plot to sterilise Muslims.
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