More than 80 people have died in a riverboat accident in the Democratic Republic of Congo, the presidential office announced on Wednesday. The boat sank in Maï-Ndombe Province while on the Kwa River on Wednesday morning, the office said. It was not clear how many passengers it was carrying. President Felix Tshisekedi said he was devastated by the tragedy. He has ordered an investigation into the cause of the accident with the aim of preventing similar disasters in the future, the presidential office said on X. River transport is key to the country of 90 million inhabitants, as distances are va…