The central agency today approached the trial court in Mumbai, seeking a direction to authorities in Assam -- as Mikhail lives in Guwahati -- to look into his safety concerns.
CBI officer KK Singh, who filed the application before the court, said he received an email this morning from Mikhail Bora, saying he feared for his life and that his mother, accused of killing his sister Sheen Bora, would try and harm him too.
"The authority concerned in Assam is required to be informed about the threat to the life of the witness," the CBI application said.
The email alleged that Indrani Mukerjea, who is lodged at a prison in Mumbai, did not want her mother Durga Ranee Bora's will to be probated (to be certified as valid by the court), and hence she was using various means to harass Mikhail Bora.
The court passed no order on the CBI plea today, while continuing to record the testimony by Indrani Mukerjea's former secretary Kajal Sharma.
Indrani Mukerjea, her ex-husband Sanjeev Khanna and her current husband and former media baron Peter Mukerjea are facing trial for the murder of Sheena Bora in April 2012. Sheena was Indrani's daughter from an earlier relationship. Mikhail Bora is her second child.
According to the CBI, Indrani Mukerjea, after murdering Sheena Bora, tried to kill Mikhail Bora too by spiking his drink, but he escaped. The agency alleged that financial disputes led to Sheena Bora's murder.