Four people were killed and 15 injured in a bus and tractor-trolley collision on the Jalandhar-Jammu highway in Jalandhar, in the early hours today. The four deceased in the accident include the bus driver and three passengers. The driver belonged to Jammu and Kashmir and a father-son duo was from Delhi whereas the fourth deceased was from Ludhiana. The driver of the trolley, Parvinder Singh, also sustained leg injuries. All the injured were transported to various hospitals and are currently under treatment