LIRA, Uganda — A United Nations plane crashed as it was landing in Kinshasa, Congo, on Monday, killing 32 of the 33 people aboard, United Nations officials said.

The plane, traveling from the city of Kisangani on the Congo river, was carrying 29 passengers and four crew members, a United Nations official said. The passengers included peacekeepers, United Nations officials, humanitarian workers and electoral assistants, the official said.

A United Nations official told Reuters that the plane was trying to land in rainy, windy weather, and that it “landed heavily, broke into two and caught fire.”

The United Nations has not yet disclosed the identity of the sole survivor, and officials said the cause of the crash was not yet known.