The CBI, however, has opposed the state's right to file an appeal, asserting that, as the prosecuting agency, it holds the authority to appeal based on the inadequacy of the sentence.

KOLKATA: The Calcutta High Court on Wednesday said it would hear the CBI, the victim's family and the convict before deciding on the admission of an appeal filed by the West Bengal government claiming inadequacy of sentence given by a trial court in the RG Kar hospital rape-murder case.

The central agency is likely to file the appeal against the Sealdah court order by Friday with detailed arguments in favour of capital punishment

The West Bengal government has already approached the high court, challenging the verdict and seeking death penalty for Sanjay Roy.

India's West Bengal state launched an appeal on Tuesday to overturn a life sentence in favour of the death penalty for a police volunteer convicted of the rape and murder of a junior doctor, a senior lawyer aware of the development said.

The Bengal government has moved a division bench to file an appeal for the death penalty for the convict, Sanjay Roy, in the RG Kar rape-murder case.