A passenger was killed and 15 others injured today as a private bus overturned near Pandaul Bazar in Bihar's Madhubani district, a police officer said. The incident took place as a private bus carrying scores of passengers on way to a destination in Madhubani district overturned after the driver lost control of the vehicle, Sakri police station in-charge Satyendra Kumar Gupta said. While an unidentified passenger died on the spot, 15 others sustained injuries, he said adding the injured persons were taken to a Primary Health Centre (PHC). The attending doctors referred six seriously injured ones to Darbhanga Medical College and Hospital (DMCH) in view of their critical conditon. The bus driver and cleaner escaped from the spot, the police officer added.