Head Constable Vijay Prathap Singh allegedly opened fire from a 9mm carbine, killing Assistant Sub-Inspector Ganesan and head constables Subburaj and Mohansingh at the CISF barracks in Kalpakkam township, about 10 km away from the nuclear complex, according to police and plant officials.
"Three CISF personnel have been killed. The incident happened around 5.30 am. We are enquiring how the incident happened," C Vijaya Kumar, Kancheepuram Superintendent of Police said.

Assistant Sub-Inspector Prathap Singh and head constable Govardhan Singh sustained major injuries and are being being treated at a hospital, police said.
Vijay Prathap Singh has been arrested and is being questioned, police said.

Asked whether operations at the nuclear complex was affected due to the incident, Madras Atomic Power Station Director T J Koteeswaran said, "The incident happened some 10 km away in the township and so operations were not affected. I am awaiting more information on the incident".

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