New Delhi, March 19 -- American national Matthew Aaron Van Dyke has emerged as the key figure in an ongoing investigation by the National Investigation Agency (NIA) into an alleged international network involved in training insurgent groups and smuggling drones into Myanmar.

Van Dyke, a self-described combat specialist and founder of the security firm Sons of Liberty International (SOLI), was arrested at Netaji Subhas Chandra Bose International Airport on March 13, around 9 pm, as part of a coordinated crackdown.

He was detained along with six Ukrainian nationals -- Hurba Petro, Slyviak Taras, Ivan Sukmanovskyi, Stefankiv Marian, Honcharuk Maksim and Kaminskyi Viktor -- who are now in NIA custody till March 27 following orders of a spec...