Gunmen in Pakistan have killed three people, two policemen and a polio worker, in separate shootings targeting polio workers in the country.
The two policemen were providing security to a team of polio-vaccination workers in north-west Pakistan. The polio worker was shot dead in a separate incident, said reports.
No group has claimed responsibility for this latest attack but Pakistani militants have killed over a dozen polio workers and police protecting them for many years.
The Taliban are opposed to the polio vaccination schemes, which they believe are covers for international espionage.
They also accuse the polio workers of being part of a Western plot to give vaccines to Muslim children to make them sterile.
The first attacked happened on Friday when two policemen were riding in a motorcycle protecting a team of polio-vaccination workers travelling to the town of Swabi. The town lies 100 kilometers (60 miles) northeast of Peshawar, the capital of Khyber Pakhtunkhwa province.
Hours later, a polio worker named Yousef was shot dead in his home by unknown assailants, said Esmattulah Wazir, a political administrator in the tribal areas, according to reports.
In both attacks, the assailants fled from the scene.
Pakistani Taliban leader Mullah Fazlullah started the current campaign against polio immunization in 2005 which become more vicious when Osama bin Laden was killed by US forces in a secret raid in 2011.
Pakistan is one of only three countries where polio remains endemic, the others being Nigeria and Afghanistan.