Once person was killed while two others were seriously injured when an ambulance collided head-on with a truck on NH-31 at Dharamganj Chowk in Kishanganj, the police said.
The driver of the ambulance, identified as Anwarul Haq, died on the spot.
The injured have been admitted to the Medical College and Hospital in Kishanganj.
The police seized the truck and arrested its driver.
