What caused China's Eastern Star cruise ship to capsize in the Yangtze?
Tornado may be to blame for accident that has left more than 400 people missing
The Yangtze River accident is possibly one of the worst tornado-related disasters in modern Chinese history.
The Dongfangzhixing, or Eastern Star, carrying more than 450 people, capsized during a powerful storm in Hubei province on Monday night.
A rare tornado occurred in the vicinity of the accident during the storm, the National Meteorological Information Centre said.
Radar data analyses show wind speed exceeded 117km/h at the time - enough to generate waves higher than 14 metres.
It remains unclear if the tornado caused the accident. And if it did, whether it hit the ship directly, or caused it to change course suddenly.
GPS data shows the vessel may have made a sudden U-turn before it capsized.
