Two CRPF personnel were killed after militants allegedly attacked a security force camp in Bishnupur district of Manipur in the wee hours of Saturday. Two other personnel were also injured in the attack, said police.

The deceased were identified as CRPF Sub-Inspector N. Sarkar and head constable Arup Saini. Two other personnel -- inspector Jadav Das and constable Aftab Das -- received splinter wounds.

The attack took place at an India Reserve Battalion camp at Naranseina, where the CRPF's 128 ballion was stationed to provide security. The area comes under Moirang police station limits.

"The militants fired indiscriminately from hilltops, targetting the camp. It started around 12.30 am and continued till about 2.15 am. The militants also hurled bombs, one of which exploded in the outpost of CRPF's 128 battalion," PTI quoted a senior police officer as saying. A massive search has been launched to find the attackers.