The attack took place around 1 pm at the headquarters of the militant group led by Maulana Nabi Hanfi in Speen Tall area of Kurram region in the Federally Administered Tribal Areas (FATA), Xinhua reported citing state-run PTV channel.
The five children were passing by the site after attending school when the blast occurred. The other four dead were militants.
At least 15 people were injured in the bombing.
Four nearby houses were also damaged in the blast.
No group claimed responsibility for the attack, but Xinhua said it may have been because of an internal conflict between two militant groups led by Maulana Hafiz Ziaur Rehman and Maulana Nabi Hanfi.
Both groups have been at odds with each other for the last two years and have been involved in killing and kidnapping of rival fighters in Kurram.
Islamabad: At least nine people, including five children, were killed on Saturday when a suicide bomber rammed an explosives-laden vehicle into a house used as headquarters by a militant outfit in Pakistan's northwest tribal region.
First Published: Saturday, July 21, 2012, 15:49