Islamabad, Pakistan (CNN) -- A suicide bombing killed at least four people and injured 14 others Thursday in the Pakistani city of Peshawar, an official said.
The blast occurred at a checkpoint on Mall Road, a major thoroughfare in a commercial area, said Mian Iftikhar Hussain, information minister for Northwest Frontier Province. The checkpoint is next to a building that houses airline and insurance company offices.
The attacker detonated his explosives after he was stopped and searched, Hussein said.
Police cordoned off the area while ambulances shuttled casualties to a nearby hospital.
Peshawar, the provincial capital, is situated on the road into Afghanistan and is considered by many to be at the core of Pakistan's war on terror.
Since October, the city has been the target of a series of attacks launched by militants in retaliation for a major Army offensive to root out the Taliban.
Journalist Umar Aziz Khan contributed to this report.