The insurgent Khekaho Rochill, 34, was arrested from Dimapur in Nagaland by NIA in coordination with Assam Rifles, a press release issued by the agency said.
During investigation, his role emerged as one of the conspirators in providing financial support to carry out terror activities in the country, including the firing on Assam Rifles at Indira Gandhi Stadium, Kohima on March 26, this year, it said.
"From his possession, documents, laptop and mobile phones have been recovered which are being examined and are likely to provide vital inputs about NSCN (K)," NIA said.