Gunmen kill polio worker during vaccination campaign in Pakistan

The campaign was launched on Monday (AP)

Gunmen on motorcycles have opened fire on police escorting a team of polio workers during a door-to-door vaccination campaign in north-western Pakistan, killing an officer and a polio worker, officials said.

No-one immediately claimed responsibility for the attack in Bajur, a district in the Khyber Pakhtunkhwa province and a former stronghold of the Pakistani Taliban, according to local police chief Abdul Aziz.