The arrestees are Mahmudur Rahman alias Russell, 19, Jahirul Islam alias Jahir, 22, and Shahadat Hossain alias Emran, 19.

On information from earlier arrested Akash, regional commander of Tongi and Uttara JMB, Gazipur police arrested Jahir and Shahadat from their Namasolai home in Kaliakoir upazila at 4:00am yesterday.

Following their lead, Detective Branch (DB) of police raided the home of Russell at Asgana village under Mirzapur upazila in Tangail at about 5:00am and arrested him.

Later they unearthed two handmade grenades and bomb-making materials, including several detonators and 33 lead splinters, in a bush behind his house.

Jahir told newsmen that he took part in the August 17 bomb blast at Gazipur crossing. He also said the grenades were produced in a local factory of the JMB.

Earlier on Monday, Rapid Action Battalion arrested Akash at Ashulia Bazar and recovered huge bomb making materials from "Tangail Mess" at Gazipura village in Tongi on Tuesday.