At least four members of same family including a couple, their daughter and another were crushed to death by an over speeding dumper here on Saturday. Police said that in Razzaqabad locality of the metropolis city of Karachi, an over speeding dumper ran over pedestrians resulting death of four including a man, his wife, a daughter and another woman. The bodies were shifted to hospital for medico-legal formalities. The police took truck into custody, arrested the driver and after registering a case against him started the investigation.