DHAKA,(Pakistan Point News - APP - 21st july,2016) - Bangladesh's elite security force said Thursday it had arrested a top regional head of the homegrown extremist group blamed for an attack on a Dhaka cafe in which 20 hostages were murdered. Rapid Action Battalion (RAB) officers stormed a flat in an apartment building in the industrial town of Tongi, just north of the capital Dhaka, and arrested four members of the Jamayetul Mujahideen Bangladesh (JMB). "Among them was Mahmudul Hasan, the southern regional head of the JMB. He is a top militant trainer," RAB spokesman Mufti Mahmud Khan told reporters. Police recovered hand-made bombs and bomb-making materials from the house, indicating the militants "were planning to carry out an act of sabotage," he said.