The 18 Army soldiers who were killed in Manipur belonged to the 6 Dogra infantry regiment.
A top leader of Nationalist Socialist Council of Nagaland-Khaplang or NSCN(K) has been arrested by the National Investigation Agency for his alleged involvement in an ambush in which 18 Army personnel were killed in Manipur on the Indo-Myanmar border earlier this month.
Khumlo Abi Anal, a regional commander of the NSCN(K), was arrested from Chandel district of Manipur, the Press Trust of India has reported.
In the worst such attack in two decades, militants had ambushed a military convoy on June 4 in Chandel killing 18 army personnel and injuring 11 others.
The 6 Dogra infantry regiment was being de-inducted from the Moltuk Valley, when a convoy of 46 men was attacked by militants who used Rocket Propelled Grenade or RPG launchers and an improvised explosive device or IED.
Most of the soldiers killed were in the lead vehicle of the convoy, which bore the brunt of the attack. A junior commissioned officer was among those killed. Eleven were injured.
After the ambush, the Indian Army carried out a surgical strike inside Myanmar, reportedly killing about 50 militants of the groups believed to be responsible for the deadly attack in Manipur.