At least three people have been killed in Pakistan's tribal areas after the resumption of an antipolio campaign.
RFE/RL's Radio Mashaal reports that gunmen shot and killed two police officers assigned to protect a team of polio-vaccination workers in northwestern Pakistan.
The incident occurred north of Peshawar, the capital of Khyber Pakhtunkhwa Province, on December 13.
Reports said the attackers fled the scene.
There was no immediate claim of responsibility.
In a second incident, Esmattulah Wazir, a political administrator in the tribal areas, said unknown assailants shot dead a polio worker named Yousef in his home.
Militants allege that polio vaccination campaigns are used by Western nations to spy and to make Muslim children sterile.
Pakistan is one of only three countries in the world where the polio virus is still endemic.
With reporting by AP and AFP