Hanoi, July 21 -- Prime Minister Le Minh Hung has ordered an urgent investigation into the cause of a coach fire that killed seven people in the southern city of Dong Nai, while directing authorities to address the aftermath and prevent similar tragedies. The order was made in Official Dispatch No. 51/CD-TTg, signed on July 21 by Standing Deputy Prime Minister Pham Gia Tuc, and sent to the Ministers of Public Security and Construction, as well as the chairpersons of the People's Committees of Dong Nai city and Khanh Hoa province. According to the Traffic Police Department under the Ministry of Public Security, the crash occurred at around 2:00 am on July 21 at km 1839 on National Highway 1A in Hung Thinh hamlet, Hung Thinh commune, Dong N...