Gunmen killed three female polio vaccination workers in the eastern Afghan city of Jalalabad on Tuesday, officials said, adding that a blast had also rocked the provincial health department headquarters but left no casualties.
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Ghulam Dastagir Nazari, head of the immunization program at Afghanistan's Health Ministry, told Reuters the explosion took place at the entrance to the health department for the province of Nangarhar late on Tuesday morning.
Around the same time unknown gunmen shot vaccination workers at two separate locations in Jalalabad, killing two volunteers and one supervisor in the polio immunization program, all of them women, he said.
There was no immediate claim of responsibility. Zabihullah Mujahid, spokesman for the main insurgent movement, the Taliban, said they had no role in the attacks.