A senior police officer who does not want to be named told ET, "There are claims that he was abducted from Pan Bazar area in Guwahati and he had sent mails announcing his joining ISIS. We are investigating the whole development."
Akhtar was arrested in 2014 when he was heading the proscribed terror group Indian Mujahideen. A mobile phone, recovered from Akhtar s barrack in Tihar Jail 
New Delhi: Indian Mujahideen terrorist Tehseen Akhtar was on Saturday questioned for nearly four hours inside the Tihar Jail by a team of the Delhi Police s Special Cell in connection with the Mukesh Ambani bomb scare probe, jail sources said.
A mobile phone, recovered from Akhtar s barrack in Tihar Jail, is suspected to have been used for creating a Telegram channel used by a group named Jaish-ul-Hind for claiming responsibility for parking an SUV with gelatin sticks outside Ambani s south Mumbai home, Antilia , on February 25.