Investigators probing the crash of an Air Algerie jet in July that killed everyone on board say they have no solid leads on the cause of the accident.

Bernard Boudaille of France's accident investigation authority BEA says investigators still don't know what brought down Flight 5017, a McDonnell Douglas MD-83 carrying 110 passengers and six crew members, nearly two months after the jet crashed in Mali soon after it took off from Ouagadougo, Burkina Faso.

Speaking Saturday at a news conference in Bamako, Mali, Boudaille said investigators "aren't favoring any leads at the moment, we're continuing to investigate all the data we have available."

Nearly half of the dead were French. The passenger lists also included other Europeans, Canadians and Africans. The six crew members were Spanish.