ULFA's political advisor Bhimakanta Buragohain could not be released on bail on Tuesday as directed by a local court as two sureties to secure his bail were not deposited.
Granted bail by Judge Dinesh Chandra Choudhury on Friday, the ULFA ideologue was brought here from the Gauhati Central Jail, but bail petitioner, Buragohain's nephew Chandan Buragohain, could not deposit two sureties of Rs 25000 each, his lawyers said.
The octogenarian insurgent leader was taken back to the Gauhati jail and would be produced in court again on October 26.
The court had granted bail to Burgohain, who was in judicial custody since December 2003 under the Unlawful Arms Act, against two sureties of Rs 25,000 each.
He was apprehended by the Royal Bhutanese Army during Bhutan's operations against North East militants and was handed over to the Indian security forces on December 15, 2003.
Burgohain told reporters that the ULFA leadership in Gauhati Jail would follow the advice of the Sanmilita Jatiya Abhibartan formed by intellectuals for initiating the peace talks between the ULFA and government.
Lodged in the Tezpur jail, he was shifted to Gauhati Central Jail early in 2010 following the arrest in Bangladesh of several ULFA leaders, including its chairman Arabinda Rajkhowa, to allow the top leadership to meet and discuss modalities for the talks process.
Earlier, ULFA vice-chairman Pradip Gogoi and central publicity secretary Mithinga Daimary were released.
ULFA 'deputy commander-in-chief' Raju Barua has also applied for bail.