"It crashed while attempting to land and immediately in burst into a flame", a witness told Sudan Tribune from Wau airport.
Ateny said the pilot overshot the runway, dropping onto an unpaved ground.
Images circulating on social media show the empennage of a turboprop aircraft, apparently featuring South Supreme Airlines livery.
The plane's right wing hit a vehicle and a fire started on the right side of the plane, Ateny said.
Local officials told Sudan Tribune on Monday that the plane was carrying several high-ranking military and government officials going to different states in Bahr el Ghazal region.
The plane, an Antonov 26, carried 44 passengers and had five crew members, said Youngule. Peacekeepers from Bangladesh, Nepal and China helped in the emergency work, he said.
Nine people have been pulled from the wreckage alive, according to Eye Radio Juba. "There was no single death".
It was making a trip from Juba to Wau, in northwestern South Sudan when it crashed earlier today.
"I don't have any information", said Gabriel Ngang, the manager of South Supreme Airlines, the owner of the plane.