A policeman deployed at the Haiderpur water treatment plant in Delhi shot dead his three colleagues on Monday and later surrendered, officials said. The accused, Prabin Rai (32), and the three deceased were Sikkim Police personnel deployed at the plant for its security as part of the Indian Reserve Battalion (IRBn).

A senior official said they received a PCR call at the KNK Marg Police Station at around 3 pm about the firing.