In the threat message that is addressed to the Ambanis, the Jaish-Ul-Hind terrorists said, "Next time the SUV will ram into your fat kids car you if don't agree to the demands now".
Shamima Begum, 21, who joined the ISIS when she was 15, had sought to return to the United Kingdom, to contest the UK government's decision to revoke her British citizenship.
Faisi claimed that the Kerala government gives importance to Southern-region of the state despite the northern Malabar region having the most assembly seats.
The police said that the murder was pre-planned and that a decision on a psychological evaluation of the accused will be taken only after the completion of the arrest procedures.