Bihar, Jan 12:

A Central Industrial Security Force (CISF) constable killed three senior colleagues and injured one in “deliberate” firing with his service rifle in Bihar’s Aurangabad district on Thursday, an official said.

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The incident was reported around 12.30 p.m. during changing of shift at a CISF unit deployed at Nabinagar in the district.

“Constable Balveer Singh deliberately opened fire from his service rifle during B shift briefing near the quarter guard, where he had been on duty from 9 a.m. to 12 noon,” a CISF official told IANS.

Two head constables were killed on the spot while an Assistant Sub Inspector succumbed to his injuries in a hospital, said the official, adding another head constable was critically injured.

Singh, a resident of Uttar Pradesh’s Aligarh, has been taken into custody, the official said. (IANS)