Back in August 2014 a video was released on a variety of platforms showing black cladded men pledging allegiance to the Islamic State. The video was promptly removed.
Now in January 2015, arrests have been made which flowed along after the videos release.
The four were identified as Shakhawatul Kabir, Anwar Hossain, Rabiul Islam and Nazrul Islam.
They were arrested from Dhaka’s Jatrabarhi and Khilkhet areas. ( Jan 19th article here)
the video from August 2014 below