The death toll from a suicide blast at a security checkpoint in northwest Pakistan has risen to 33, after more bodies were found and several people died in hospital, police said Sunday. The attack happened Saturday near Peshawar, the capital of North West Frontier Province, as lawmakers in the national parliament and four provincial assemblies were electing Asif Ali Zardari as Pakistan's new president. "The death toll has risen to 33, as 11 wounded died in hospital overnight and rescue teams recovered six bodies from the debris," provincial police spokesman Riaz Ahmed said. Five of those killed were policemen, he said. About 80 others were wounded and receiving treatment in hospital. "The blast was very powerful," Ahmed said, adding that the vehicle used in the attack was loaded with about 40 kilogrammes (88 pounds) of explosives.