Gunmen attacked a polio vaccination team in northwest Pakistan on Tuesday killing a health worker and two policemen — the latest deaths in a dangerous campaign to eradicate the disease.
Pakistan is one of two countries, alongside neighbouring Afghanistan, where polio remains endemic, but where vaccination teams have been targeted by militants.
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"Gunmen came on a motorcycle and opened fire on the vaccination team," senior police offer Ashfaq Anwar told the media, adding that a child was also wounded by stray bullets.
"The victims died at the scene and the gunmen escaped."
The attack happened in North Waziristan, a region that borders Afghanistan and which was once a significant refuge for Afghan and Pakistan Taliban militants.
Shahid Ali Khan, a senior government official in the district, confirmed the incident.
Scores of polio workers and security officials guarding them have been killed in militant attacks since 2012.
Agence France-Presse