The vehicle, which was placed to protect the new highway under construction in Athurugiriya, veered off the road and fell into a ditch. Four people including a Chinese national and two policemen were killed in an accident in Athurugiriya this morning.Police spokesman SSP Ajith Rohana said that a police night patrol vehicle had met with the accident on a highway under construction. The bodies of the victims were taken to the Homagama hospital. Further investigations are underway. Two policemen who were in the vehicle as well as a Chinese national and the driver of the vehicle were killed in the accident.