While no formal inquiry was conducted, the responsibility for the deaths of the Ngô brothers is commonly placed on Minh's bodyguard, Captain Nguyễn Văn Nhung, and on Major Dương Hiếu Nghĩa, both of whom guarded the brothers during the trip.
Meskipun tak ada pernyataan resmi yang dikeluarkan, tanggung jawab atas kematian kakak beradik Ngô umumnya ditujukan kepada penjaga Minh, Kapten Nguyễn Văn Nhung, dan Mayor Dương Hiếu Nghĩa, keduanya menjaga kakak beradik tersebut sepanjang perjalanan.