No one took responsibility for the attack in the neighbourhood, which is largely populated by the minority Hazara ethnic group who are mostly Shiite Muslims.
The banned Tehreek-e-Taliban Pakistan (TTP) has claimed responsibility for the blast.
Sheikh Afroz (7) and Sheikh Ibrahim (9) were playing near their house when they hit a packet in which the crude bombs were kept, triggering the blast.
The incident took place at about 7.50 a.m. after a sticky bomb attached to a Land Cruiser-type vehicle was detonated near Hotel-e-Parwan in Police District 15.
No group immediately claimed responsibility for the attack, though suspicion immediately fell on the Taliban.
Provincial police spokesman Farid Khan said most of the victims were Afghan security force members but several civilians were also among the dead.
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