UNB, Dhaka :Members of Rapid Action Battalion (RAB) have arrested the main accused in the murder case filed in connection with the July 3 killing of a man and his three sons in Nandail upazila of Mymensingh district.The arrestee was identified as Lal Miah, brother of deceased Belal and a resident of Bashati village in Nandail upazila.A team of RAB-2 arrested him from a garage in Mohammadpur area of the city on Thursday evening, said RAB sources on Friday. Later, he was handed over to Nandail Police Station. On July 3, Belal, 50, and his three sons-Farid, 25, Himel, 14, and Pavel, 10 — were killed allegedly by Lal Miah and his family members over a family feud. Police had also recovered the body of Jamal Hossain, son of Lal Miah, from near a pond at the Bashati village on July 4. Rubel Miah, son of Belal Miah, filed a case with Nandail Police Station in this connection.