PESHAWAR – At least four people were killed and one injured in a blast in Lakki Marwat district of Khyber Pakhtunkhwa on Thursday. The incident took place in the Kot Kashmir area of the district in a vehicle of internally-displaced persons (IDPs). Police officials said five tribesmen, believed to be IDPs were on board when the explosion occurred. Four of them succumbed to their injuries on the spot while one was seriously injured.