The investigating team probing pro-IS Twitter account @ShamiWitness handler Mehdi Masoor's case has found a key evidence to prove his connections with the IS fighters.

IS sympathizer Mehdi Masoor, who hails from West Bengal, used his Twitter handle @ShamiWitness to help an IS fighter to enter Syria from Turkey, reports Indian Express.

IS fighter with Twitter handle @TalabAlHaqq Twitter, who had been waiting at the border since June 19, 2014 to enter Syria tweeted, “how can a mihajir stuck in southeastern turkey get help crossing through to raqqa in sha allah??”

To this @shamiwitness responded, “Tal Abyad crossing open now."

Masoor also marked the tweet to two other Twitter accounts, namely @onthatpath3 and @AbuUmar8246.

@ShamiWitness replied to @TalabAlHaqq's tweet within two hours, as per Bangalore Police.

Further @TalabAlHaqq tweeted to @ShamiWitness, @AbuUmar8246 and @onthatpath3, “Assalam aleykom, ShamiWitness could you please clarify how long will it be open?’’
@ShamiWitness tweeted back that “Jarabulus etc” might also be open.

Police sources told Express: “Mehdi provided the information and also marked tweets to the IS fighter about the open routes. This is key evidence in the case."

Mehdi Masoor Biswas, an engineer working as manufacturing executive with a Bengaluru-based multinational company was arrested on Dec 13, 2014 after Channel 4 reported that a pro-Islamic State Twitter handle @ShamiWitness was being operated from the City.