Chetia had on Wednesday got bail in the last of the four cases against him paving the way for his release from the jail.
Special judge Alokesh Bhattacharya allowed Chetia, alias Golap Baruah, to go on bail by submitting a bail bond of Rs 5 lakh and security of the same amount.
Chetia was deported to India last week after being jailed in Bangladesh for 18 years.
The Central Bureau of Investigation on Thursday placed Anup Chetia, founder member of banned United Liberation Front of Assam militant group, under arrest in connection with a nearly three-decade-old murder case registered by the central probe agency.
