The Transport Ministry has sent a team to investigate what caused a small twin- engine light aircraft to crash yesterday morning in Nakhon Phanom, killing all three people on board.ค The air accident investigators were sent by the ministry's office of the permanent secretary to gather information at the scene, Chula Sukmanop, director-general of the Department of Airports said yesterday. Police cordoned off the crash site and took the the victims to Nakhon Phanom Hospital for autopsies, he said. The DA42 aircraft, operated by the Inter- national Aviation College Nakhon Phanom, crashed in a field near Khok Kong, in Muang district, shortly after take off from Nakhon Phanom airport about 5am. No word was