Mikhail, travelling by a commercial flight, was accompanied by a friend and a police team from Mumbai who had come here to question him about his mother's alleged involvement in the killing of his elder sister, the police official said.
A local TV channel journalist who boarded the same flight as Mikhail, upon arrival at the Chhatrapati Shivaji Airport in Mumbai aired visuals of him being taken in a police vehicle to Thane police station.
The police team had come to Indrani's parents' house, No. 8 in Sundarpur Byelane One in Ganeshguri area of the city yesterday afternoon to investigate into the murder case.
Mikhail was first questioned at his grandparents house and then again for two hours at the Dispur Police Station last evening where he was asked about the case.
He had yesterday said he could only go to Mumbai if his aged grandparents were taken care of by the government.
Since Indrani's arrest he had claimed that he had evidence on the murder case of his sister.
He said he will wait till she (Indrani Mukherjea) confesses it in front of the police and if she does not, then he will do whatever is necessary.
Yesterday and the day before, prior to the visit of the Mumbai Police team, Bora had claimed before reporters that he had evidence on the murder case of his sister and that he feared for his life as he "may be the next target".
Indrani later left them with her parents U K Bora and Durga Rani Bora at their residence here before leaving for Kolkata where she married Sanjiv Khanna, who was also arrested for his alleged involvement in this case.
