A child was killed and five others were injured today in a blast at a playground near a madrassa in northwest Pakistan's Tank town. The explosion occurred when a group of children were playing at the ground located a short distance from the seminary. The exact nature of the blast could not be immediately ascertained. Geo News channel reported that the blast was apparently caused by a suicide jacket that was found by the children at the playground. It said one child was killed and five others were injured in the blast.