A suicide bomber blew himself up when he was stopped at a police check post in this northwestern Pakistani city on Thursday, killing at least four persons and injuring 11 others in the latest in a wave of terrorist attacks across the country.

The bomber detonated his suicide jacket when he was stopped by policemen at the post outside the State Life Insurance Corporation building on the busy Mall Road in Peshawar cantonment at around 11 am, officials and witnesses said.