According to the NIA, alleged kingpin Mohammed Ibrahim Yazdani was using 'tutanota' software, a secure encryption mail to be in touch with his handler abroad. The coordinates of places where logistics like weapons were to be delivered, were sent to him by his handler through this email.
Tutanota is a combination of Latin words "tuta" and "nota" meaning "secure message". It provides a platform for not having any personal data and also does not log Internet Protocol address to secure locations of sender or receiver.
Ilyas had also purchased a weighing machine from a shop at Biwi bazar for weighing explosive precursors and chemicals, the NIA alleged.
Another accused Abdullah Bin Ahmed Al Amoodi alias 'Fahad' had procured nine Aircel preactivated SIMs from a promotional temporary stall at Charminar bus stop.
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Subsequently he had purchased five Chinese mobile phones from a mobile shop at the Charminar bus stop so that they can be used in their planning and operations.
The NIA had on June 22 lodged a common FIR against IS for "criminal conspiracy to wage war against the government of India" by collecting weapons and explosive materials to target public places, religious sites and sensitive government buildings in various parts of country and arrested five persons in this connection.
According to the central agency, the gang was preparing improvised explosive devices for carrying out blasts, and was being guided by an online handler, suspected to be based in Iraq or Syria.