A gunman on Thursday barged into a house in northwest Pakistan and shot dead five members of a family. The incident occurred in Nowshera district of Khyber Pakhtunkhwa province. District Police Office Mansoor Aman said the residents belonged to Peshawar`s Badaber area. The slain included a couple, their daughter and two sons. The motive behind the murders was yet to be known. In a separate incident, five people were killed and four injured as lightning struck their house in Sur Gul Village Kohat district. The dead included husband and wife and three children.