Militant group Jundullah killed a polio vaccination team member in Pakistan's Faisalabad city Tuesday.
Ahmed Marwat, claiming to be a spokesman of Jundullah, said that polio workers would always be on the group's hit list throughout Pakistan and that it would continue carrying out attacks on them, Dawn online reported.
The attack occurred in a residential area of the city, where workers were immunising children on the second day of an anti-polio campaign.
Mohammad Sarfaraz, 40, was a schoolteacher working as a volunteer in the campaign, a police official said.
"Gunmen on a motorcycle fired six shots and he died on the spot," the official said.
Pakistan is one of only three countries where polio remains endemic.
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Attacks on immunisation teams have claimed at least 67 lives since December 2012.
The militants claim that polio vaccination is a front for espionage or a conspiracy to sterilise Muslims.
Taliban insurgents had also claimed the killing of two policemen assigned to protect an immunisation team Monday.
Mohammad Khorasani, the main spokesman for the Tehreek-i-Taliban Pakistan (TTP), Tuesday claimed responsibility for the killing of two policemen in the town of Buner near the Swat Valley.
"Police are our target and both the men were killed because they were from the police force," Khorasani said.