The United Nations says a plane carrying 17 people on a humanitarian aid flight has crashed in Congo. The company that operated the plane says on its Web site that an aerial survey by helicopter indicates there are no known survivors. The UN Office for the Coordination of Humanitarian Affairs says the Beechcraft plane went missing in bad weather late Monday with two crew and 15 passengers on board. It was located Tuesday 15 kilometers northwest of the airstrip at Bukavu in eastern Congo, its intended destination. The UN office's spokeswoman Elizabeth Byrs says rescuers are trying to reach the site. The plane was operated under contract to US-based company Air Serv International.