NEW DELHI, Nov 13 - Intelligence agencies and the CBI have been interrogating Anup Chetia, sources said.
Chetia, who is likely to be shifted to Guwahati later this week, has been arrested in a murder case of ex-counsellor of Golaghat, Deboksi Dhar Choudhury. He was killed by ULFA on August 29, 1986 and Chetia is alleged to be involved in the criminal conspiracy.
The CBI had registered a case on March 21, 1988 at the request of the Government of Assam in connection with the killing.
Sources said that before releasing the three ULFA members, the Government of Bangladesh made Anup Chetia and two others sign a bond consenting that he was going to his country on his own will in good health and was fully aware of it.
Sources said that the jail authorities released the three at the Kashimpur Jail gate and officials of the Indian High Commission along with CBI and IB sleuths received them.
Chetia, Shakti and Babul were taken to Benapole-Petrapole, the border to cross over into India, and the process was facilitated by the Border Guard Bangladesh (BGB) and the Border Security Force (BSF).
Sources said that early this year Chetia and his two associates sought consular access and JP Singh, an official of the Indian High Commission met them in jail, when they agreed to return to India.
It was duly conveyed to the Bangladesh Government through diplomatic channels before the ground was prepared to hand him over to India.
During the last Home Minister-level meeting, India again repeated its request to Dhaka to hand over Chetia to them. In exchange, Bangladesh urged India to return Nur Hossain, prime accused in the sensational Narayanganj multiple murder case of 2014.