Gunmen shot to death a policeman protecting a team of female polio workers in northwestern Pakistan on Wednesday, the latest in a series of attacks on people working on the U.N.-backed vaccination campaign, police said. No group has claimed responsibility for the attacks, according to a report of the Associated Press. The attack on Wednesday occurred in the district of Mardan in Khyber Pakhtunkhwa province, said police officer Mohammed Nabi Khan. One policeman was killed and another wounded. No polio workers were harmed since they were inside a home giving polio drops to children at the time of the attack, said Khan.
