Thousands of Eurostar passengers are suffering severe delays and cancellations after two track fatalities and cable theft.
French media reported that 600 metres of copper cables were stolen overnight near Lille.
Eurostar said this is forcing it to run services on alternative routes, causing extended journey times.
Its services were already disrupted because many trains and staff members were out of position after two fatalities on rail lines in France on Tuesday.
At least five services on its London-Paris route were cancelled on Wednesday, and seven others were delayed by around an hour.
The operator said it is handing out water to passengers onboard delayed trains, and has teams at stations to provide assistance.
Affected passengers are able to change their travel plans free of charge, or request a full refund.
Eurostar said in a statement: “We are deeply sorry to confirm that there were two separate fatalities on the LGV Nord high-speed line between Lille and Paris yesterday.
“Our thoughts are with the families and friends of those who lost their lives.“
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