Bengaluru, Dec 16 (ANI): A popular pro-Islamic State Twitter account traced to an Indian engineer was back up on Monday (December 15) as police combed through tens of thousands of followers to identify sympathisers of the militant group. Mehdi Masoor Biswas, who police said was behind the @ShamiWitness Twitter handle, has cooperated with investigators since he was picked up from his one-room apartment in Bengaluru city on December 13, the government said. Mehdi's account was disabled at that time and it was not clear how it became active again. Police said the account was part of their investigation but not under their control. Security officials said @ShamiWitness had been reactivated to determine if Mehdi was a cheerleader or an online recruiter for Islamic State.