The suspect, who appears to be in his twenties, was identified as Marjan, Dhaka Tribune quoted a counter terrorism unit official as saying.
The official said the terrorists had sent "protected text" -- which likely included photos and regular updates from inside the Holey Artisan Bakery -- to a link and Marjan had the password to access them.
The suspect -- a Bangladeshi and likely highly educated -- coordinated with the attackers as well as the mastermind during the events of July 1 night, the official added.
"He is a second-tier [militant] leader," the official said, adding that they were not sure about his true identity but arrested JMB members had identified him as "Marjan".
Investigators did not have more information at the moment, he added.
The investigators believe Tamim Ahmed Chowdhury masterminded the attack. On August 2, police put a Taka 20 lakh ($25,511) reward on him. Tamim is believed to be hiding in Dhaka.
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