BERHAMPUR: Dreaded hired killer Bikram Mallik and his three associates were nabbed by Ganjam police from Gangapur village following an exchange of fire at a house at Gangapur village late on Monday night. A police constable Basant Upadhayay was seriously injured by a bullet of the miscreants. Ganjam SP Nitinjit Singh had also reached the spot. The three associates were identified as Susil Behera, Raju Sethi and Manoj Pradhan.