Unidentified gunmen shot and killed on Monday a police officer working on Pakistan's first polio vaccination drive of the year, police said. Pakistan has deployed thousands of police officers to protect health workers posted to go house-to-house to inoculate children and are targeted by militants who falsely claim the vaccination

A Pakistan police officer travelling to guard polio vaccinators was shot dead Monday, police said, on the first day of a nationwide immunisation effort after a year of rising cases.