Members of Rapid Action Battalion (RAB) in a drive detained five people, including the mastermind of Tongi double murder from Dendabor area in Savar.A machete and other weapons used in the murder have been recovered from their possession.Confirming the matter, Assistant director of RAB Media and Legal Wing ASP Mizanur Rahman Bhuiyan said, the identity of the detainees could not be known immediately.Details regarding the matter will be disclosed in a press briefing later in the day.The two young men were hacked to death by miscreants in Tongi area on May 15. A case was filed in connection with the killing on May 16.