PARIS (AP) — Investigators probing the crash of an Air Algerie jet in July that killed all 116 people 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.