Detective Branch (DB) of Police have detained three members of Jama'atul Mujahideen Bangladesh (JMB) from Uttara area in Dhaka.
The detainees are AHM Kharul Asad alias Shohag, technical assistant of JMB, Mir Faifi alias Zarmin, former Sura member of JMB, and Md Kafil Uddin Bin Amin, also a Sura member of JMB.
They were arrested during a drive in Uttara area around 7:45pm Saturday.
In a press briefing, Joint Commissioner of DB Monirul Islam said their involvement with Hussaini Dalan blast was not found but they held several meetings with JMB leaders.
"During the meeting, they used mobile phone jammer in a bid to avoid arrest," Monirul said.
He said police would investigate to find out the source of jammer used by the JMB men.
DB police also recovered many books of extremist ideology, trainning manual, and target list from their possession.