CMP Detective Branch Additional Deputy Commissioner AAM Humayun Kabir claims the suspects are members of Neo-JMB, the revived chapter of Jama’atul Mujahideen Bangladesh.
They have been identified as Ashfaqur Rahman, 21, and Rakibul Hasan, 20.
The police detectives arrested them in a drive on a five-storey building near Shubhopur Bus Station at West Madarbarhi under Sadarghat Police Station on Monday night, Humayun said.
The detective also said the duo stashed the grenades and suicide vest as part of a plan to carry out attacks.
He said details would be revealed at a press conference on Tuesday.