No group claimed responsibility for killing DPO Sajid Khan Mohmand, a longtime police veteran and father of six.
ISIS planned to build the headquarters of its Khorasan branch near the border with Pakistan, but operations in the past month have put an end to those ambitions.
Civilians who once sympathised with the Taliban have developed a hatred for the militants after they killed people in horrible ways, observers say.
The explosion targeted a police vehicle, killing police and civilians, on the last Friday of Ramadan.
Children suffer the most from terrorism and militant attacks, health professionals and security analysts say.
ISIS has been making inroads in Pakistan through alliances with local militant outfits such as LeJ and the Jamatul Ahrar faction of Tehreek-e-Taliban Pakistan (TTP).
The two groups are killing each other over the ability to plunder long-suffering civilians.
Pakistan has so far blocked 12,968 websites of proscribed organisations under the National Action Plan.
The Khyber Pakhtunkhwa government has decided to give free medical and dental education to slain children's siblings.
The Taliban's actions, including murdering Muslims in mosques and destroying schools, run counter to Islam and to national interests.