Pakistan tightens security after blast in Karachi

Security was tightened on Friday after a bomb killed at least 15 people and wounded many others at a club in Karachi on Thursday. Investigators visited the blast site in search of clues at the scene where the wreckage of furniture lay strewn close to blood stained walls inside a small room in the club where the blast had occurred. Police and paramilitary troops guarded the area and streets surrounding the blast site.