From BBC News:
A man is believed to have been killed when a blaze tore through a train
on the Channel Tunnel rail link.
More than 50 firefighters are at the scene almost a mile inside a tunnel
under the Thames between Swanscombe, Kent and Thurrock in Essex.

See:
http://news.bbc.co.uk/1/hi/england/4157924.stm

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DB.