"Based on a specific information, the Army launched an operation in the wee hours of December 2, 2015 in the area of Kukarkata in Goalpara District of Lower Assam," a Defence spokesperson said in a statement.
During the operation, three hardcore extremists of LAEF, a militant outfit based in the Garo Hills, were apprehended, he said.
The apprehended cadres have been identified as Charan Marak alias Chukhan, Walter Marak alias Gingjong and Let Marak alias Rongdot.
They had undergone training at NSCN's Hebron Camp in Nagaland and in the training camps in North Garo Hills, he said.