Jawad Ali, in charge of the anti-polio campaign in Kurram, told the AFP news agency that the pair had been killed "on the spot".

BBC: Polio workers in Pakistan

"Mousavi was not allowed to recite the Koran verses said on such occasions and he was immediately surrounded by anti-riot police who led him to his car, " one person told AFP.

BBC: Iran police clash with mourners

Police also "mercilessly beat" half a dozen lawyers who were chanting anti-government slogans at a court in the city of Rawalpindi, lawyer Mudassir Saeed told AFP.

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