The Alipore Sessions Court had, on September 9, granted bail to Mitra, after he spent over 21 months in prison in connection with the chit fund scam.
The matter is likely to be taken up by an appropriate bench of the High Court later this week.
The CBI challenged the bail on the ground that Mitra was still "influential" and "an inseparable part" of the ruling Trinamool Congress (TMC) in the state, despite not being a minister or an MLA at present and thus, him being out on bail could affect the witnesses in the case.
Alipore Sessions Court judge Uttam Kumar Nandy had, on Friday last, granted the relief to Mitra on a bail bond and surety of Rs 15 lakh each, rejecting the CBI's opposition.
Imposing conditions on his bail, the court had directed Mitra to appear before the CBI investigating officer once a week, surrender his passport and not to leave Bhowanipore police station limits.
The former minister has been charged under sections 409 (criminal breach of trust by public servant), 420 (cheating) and 120B (criminal conspiracy) of the IPC.
He had also alleged that the CBI was delaying the investigation and as such, Mitra should be granted bail.
The CBI counsel opposed his plea, saying the investigation into the Saradha scam, involving over Rs 2,500 crore of public money, was at a "crucial stage" and releasing Mitra now could hamper the process because the former minister was still "a very influential person" and had access to key witnesses in the case.
But, the breather had turned out to be a brief one as the Calcutta High Court cancelled his bail on November 19 on a petition by the investigating agency.
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