Hangu is a Sunni majority town, but is located on the main route to the mainly Shia Kurram region.
BBC: Pakistan bomb: 21 die in Hangu Shia suicide attack
Two polio vaccination workers have been killed in a landmine blast in the Kurram tribal region of north-west Pakistan, officials say.
BBC: Polio workers in Pakistan
Correspondents say Sunni militants may have planted the mine - the upper Kurram area is dominated by Shias who do not oppose anti-polio efforts.
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".
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