Images being widely shared on social media appear to show the train that has derailed in a mountainous area of Switzerland.
At least two carriages appear to have left the tracks and are hanging over a ravine.
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The prime minister has said the debate over Britain's EU membership has affected his long-term friendship with the mayor of London.
Tonight a band of cloud and rain will spread into Scotland and Northern Ireland.
Greenpeace has obtained leaked documents which reveal how much the US has been pushing the EU on the TTIP trade agreement.