The attack targeted the weekly Friday prayers in Mohmand agency, bordering Afghanistan. The bomber shouted 'Allahu Akbar' and blew himself up when the prayers were in progress.
At least five of those killed were children.
The death toll has now risen to 36 after more people succumbed to their injuries, said assistant political agent of the agency Haseebur Rehman.
A curfew has been imposed in the area serach operations were being conducted to arrest other planners of the attack.
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Pakistani Taliban routinely targets courts, schools and mosques in the tribal region, where the military has launched a massive operation to flush out the terrorists since 2014.
Prime Minister Nawaz Sharif in a statement has expressed grief over the loss of lives and called it a "cowardly attack by terrorists (who) cannot shatter the government's resolve to eliminate terrorism from the country."
The Pakistani Taliban was formed in 2007.
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