Gunmen on motorcycles opened fire on Pakistani police escorting a team of polio workers Tuesday during a door-to-door inoculation campaign in a former Pakistani Taliban stronghold, killing two policemen and a polio worker, police said.
No one immediately claimed responsibility for the attack in North Waziristan, a district in the Khyber Pakhtunkhwa province. The attack came a day after the government launched another nationwide anti-polio campaign amid a spike in attacks.
