Rapid Action Battalion (RAB) has arrested a suspected member banned militant outfit Ansar al-Islam from Kamlapur area in Dhaka.
Towfiq Hossain, 34, was detained with leaflets and books, RAB 11 Commanding Officer (CO) Kamrul Hassan confirmed on Sunday.
He said: "Acting on a tip-off, we conducted a drive in the area and arrested him around 11pm on Saturday."
"Towfiq is an accused in a case filed with Rupganj police station under Anti-Terrorism act."
The RAB official said details regarding the matter will be disclosed in a press briefing later in the day.