The CBI is likely to file the appeal against the Sealdah court order by Friday with detailed arguments in favour of capital punishment, they said.

The trail court had sought death penalty for Sanjay Roy but was turned down by the trail court, where Additional District and Sessions Judge Anirban Das said that the crime did not fall under the ‘rarest of the rare’ category.

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