South Sudan authorities are investigating the cause of Wednesday’s plane crash at the country’s Unity oilfield, that claimed the lives of 20 passengers and crew, with one survivor.

Only one person has survived a plane crash in South Sudan, which killed 20 oil workers who were on board, the government said. The plane, which was heading to the capital, Juba, crashed three minutes after take-near the oil fields in Unity State on Wednesday morning,

An official says at least 18 people have been killed when a small plane crashed in a remote part of South Sudan