dhaka pilot bangladesh national carrier bangladesh biman arrest wednesday suspect terrorism offences include plot keep passengers hostage fly plane house top government leaders police say sabbir enam 31 detain tuesday formally arrest wednesday senior police official say rapid action battalion special security force bangladesh police arrest three others include mother say mufti mahmud khan director rab responsible legal media wing force tell reuters sabbir close link militant group jamaat-ul-mujahideen bangladesh jmb plan fly plane residences top government leaders also plan take flight keep passengers hostage head middle eastern country mufti say detail plan ever carry immediately available arrest pilot available comment jmb islamic militant organization 2005 detonate 500 bomb 300 locations across country aim set islamic state bangladesh police arrest pilot 'suspected air attack plot