The News Minute| October 8, 2014| 09.50 am ISTA Central Industrial Security Force personnel allegedly opened fire on his colleagues in Kalpakkam power plant in Tamil Nadu. , killing three of CISF colleagues in the process.The shooting by the 40 year-old CISF personnel occured in the early hours of Wednesday, said police according to NDTV.The other two injured are undergoing treatment in a nearby hospital. The motive for the shooting is not known, said the report .