A group of men fired 5-10 rounds from "ineffective" small firearms and lobbed a crude grenade at the base at Niausa in Longding district at 1:15 am, Kohima-based defence spokesman Col. Chiranjeet Konwer said. The sentries retaliated and the attackers fled, he said.
"There was no casualty or damage to properties of the COB. The retaliatory fire had to be controlled keeping in mind the safety of the villagers in the vicinity," the spokesman said. Operations are being launched against the attackers, he said.
Police sources from Longding said the NSCN(K), which is active in the district, was behind the attack.