Patna, March 9 (IANS) Two policemen shot each other dead, following an argument on Monday in Bihar, police said.

The incident took place at Bikram block office in Patna, where they were on duty, Patna Senior Superintendent of Police Jitendra Rana said.

"We have started the investigation to ascertain the actual reason behind the incident," he said.

According to police, they had a heated argument over some issue, following which both shot each other dead with their service rifles.