The AirAsia plane that crashed into the sea last month was climbing at a speed "beyond normal" before stalling, radar data is thought to have shown.
According to the AFP news agency, the country's transport minister said: "The plane suddenly went up at a speed above the normal limit that it was able to climb to. Then it stalled."
Flight QZ8501 went missing on 28 December in stormy weather over the Java Sea.
Terrorism has been ruled out as a cause of the crash, but a search and rescue said last week that the plane had experienced an explosion before hitting the water.
The bodies of 53 of the aircraft's 162 passengers and crew have been recovered in search efforts so far.
More top news
The Democratic presidential candidate may also have shown his cards on his choice of running mate.
The US president also shared a post on Twitter accusing Dr Anthony Fauci of misleading the public over hydroxychloroquine.
Fears over an impending second wave of coronavirus dominates Wednesday’s front pages.