Non-crew members were in the cockpit of a plane that crashed killing the Polish president and more than 90 others, an investigation has found.
The question of whether the crew were pressured to land remains unanswered, an official said.
One of those in the cockpit has been identified, but the BBC has learned it was not the president.
The plane crashed as it tried to land at Smolensk in western Russia on 10 April, killing dozens of senior Poles.
The investigation, which was releasing its preliminary findings of the investigation, confirmed crew were repeatedly warned about poor weather.
Full story: BBC News – Non-crew in cockpit in Polish president’s plane crash