Balamurali, attached to Pondicherry Armed Police wing, was admitted in a critical condition to the government general hospital here, police said.
Police said Balamurali, who was on security duty at the treasury office in Bahoor last night, was found writhing in pain on the premises of the office when another constable arrived at the office in the morning to relieve him. He allegedly shot himself in the chin.
Balamurali, who was profusely bleeding, was admitted to the Intensive care unit.
