Watch: Russia finds black boxes after plane crash
Experts on Monday started studying the plane's two flight recorders
Russian International Aviation Committee released still images of the flight recorders of the plane which crashed near Moscow a day before, claiming 71 lives.
Experts on Monday started studying the plane's two flight recorders, as well as some of the around 500 plane fragments recovered so far. Footage from a CCTV camera that captured some of what happened was posted online on Monday. It showed what looked like a large ball of fire streaking through the sky.
Investigators, who have opened a criminal case into the tragedy, said in a statement however that the plane had been in one piece when it plummeted towards the ground and not on fire. An explosion had occurred only after it crashed, they said.
President Vladimir Putin has ordered a special commission to investigate what caused the AN-148 plane operated by Saratov Airlines to crash outside Moscow shortly after taking off for the city of Orsk in the Orenburg region, about 900 miles (1,500 km) southeast of the capital.
Among the possible causes, investigators are looking into weather conditions, human error and the plane's technical condition. The plane's crew did not send any distress signals.