A suicide bomber struck a police vehicle at a city in the restive northwest 
Deputy Inspector General of Police Iftikhar Khan said the bomber, who was on foot, targeted the vehicle near the main police station of Bannu in Khyber-Pakhtunkhwa province.
Other officials said a police constable, a child and three civilians were among those killed. Four persons were killed instantly while a man succumbed to his injuries in hospital.
The 15 injured people were taken to a nearby hospital, where an emergency was declared.