KUALA LUMPUR, Malaysia (AP) — The Malaysia Airlines jetliner that went down in war-torn Ukraine did not make any distress call, Malaysia’s prime minister said Friday, adding that its flight route had been declared safe by the global civil aviation body.

Najib Razak, who addressed a middle-of-the-night news conference after speaking with leaders of Ukraine and the Netherlands, and to President Barack Obama, said “no stone will be left unturned” in finding out what happened to Flight 17 and the 298 people on board.