Seven people including three members of banned Islami militant outfit Jama`atul Mujahideen Bangladesh (JMB) have been arrested in a drive conducted by police in a house at Mirpur in Dhaka on Thursday morning.Police recovered grenades, explosives and firearms from the flat.The JMB men charged a grenade targeting the law enforcers during the drive. However, none was injured in the incident.Dhaka Metropolitan Detective Branch joint commissioner Monirul Islam confirmed the matter to JagoNews24.com.He said, we arrested a JMB member on Wednesday and on the basis of the information given by him, we conducted the drive and held seven people.Of the arrestees three are key members of JMB while the identity of four others is yet to be confirmed, he added.