sentences:  After the arrest, Nhung and Major Dương Hiếu Nghĩa sat with Diệm and Nhu inside the APC, and the convoy departed for Tân Sơn Nhứt.They stopped at a railroad crossing on the return trip where, by all accounts, the brothers were assassinated.An investigation by Đôn later determined that Nghĩa had shot the brothers at point-blank range with a semi-automatic firearm and that Nhung sprayed them with bullets before repeatedly stabbing their bodies with a knife.