“There are 74 bodies in the morgue at Kisangani general hospital, of which 28 were brought in this (Saturday) morning,” the organisation’s Congolese secretary general Mario-Real Shutsha told AFP.
Earlier in the day, Hewa Bora Airways director Stavros Papaioannou said there were 56 confirmed deaths, warning the toll may rise further.
The Boeing 727 operated by Hewa Bora crashed at Kisangani airport as it attempted to land in heavy rain with 118 passengers and crew.
The plane was on its regular commercial route from Kinshasa to Kisangani and Goma when it was hit the storm as it approached the airport, a local administration spokesman said.
Plane accidents frequently occur in DR Congo, often blamed on ageing and poorly maintained aircraft, the flouting of safety rules and bad weather.
Each of its 50 or so airlines has been blacklisted by the European Union.