The BSF has handed over the two top ULFA leaders, who were picked up from the Indo-Bangla border in Tripura, to Assam Police which started their interrogation.
Self-styled ULFA foreign secretary Sashadhar Choudhury and finance secretary Chitraban Hazarika, who were pushed into Indian territory by the Bangladeshi authorities, were flown into Guwahati on Friday night in a special aircraft by a team of Assam Police officials.
"We have taken over the custody of the two ULFA leaders and they will be produced in a court here today for further custody," Additional Director General of Assam Police Khagen Sarma told PTI.
The special branch of the Assam Police has started their interrogation and they will be joined by sleuths of central intelligence agencies soon.
The banned group reacted quickly calling an Assam bandh on Monday protesting the "military action" and demanding unconditional release of Choudhury and Hazarika.
Claiming that the two top leaders were picked by some camouflage men on November 1, a statement issued by the banned group's chairman Arabinda Rajkhowa said, "Instead of pursuing a peaceful political solution to the issue, Indian colonial forces are trying to settle it using military power."
Bangladesh has launched a major crackdown on ULFA militants operating from its soil by apprehending the two leaders and subsequently pushing them into Indian territory from where BSF took the duo into custody.
BSF officials, however, insisted the ULFA leaders have surrendered before them after fleeing Dhaka following an "internal clash" among the cadres.