Eurostar has cancelled all of its London to Europe services for the day because of a power failure which has caused the closure of the Channel Tunnel.
The passenger rail operator said there was a problem with the overhead power supply and a failed train in the tunnel.
The company said in a statement: "Due to a problem with the overhead power supply and a subsequent failed LeShuttle train the Channel tunnel is currently closed.
"Unfortunately, this means we have no choice but to suspend all services today until further notice. Please do not come to the station. We're very sorry for the impact the situation may have on your travel plans."
The problem also affected fellow rail operator LeShuttle with its services between Folkestone and Calais suspended.
The tunnel accommodates Eurostar services as well as LeShuttle vehicle-carrying trains between the UK and France.
The tunnel accommodates Eurostar services carrying trains between the UK and France
A Eurostar staff member at St Pancras station in central London told passengers that all trains were cancelled.
"Today, nothing at all," she added.
Another member of staff was seen handing out water bottles to people waiting by a cordon.
Cancelled train puts 'romance on hold'
One man travelling to Paris for New Year's Eve with his partner said "we'll have to put romance on hold", after their Eurostar train was cancelled.
John Paul, from Peterborough, was bought the trip as a surprise Christmas present from his partner Lucy and said they had spent five hours on a Paris-bound train before it unexpectedly returned to London.
Speaking at King's Cross St Pancras, the 46-year-old said: "We left on the 7am train this morning, we were sat on the train for about an hour, I think, waiting to leave from here, and then we got probably about an hour down the track, maybe 40 minutes, and then they basically said the train's got to stop because the train ahead got a braking issue.
"So they kept telling us that the driver was trying to fix the brakes on this other train and that the other trains were then backed up and that was basically the same story that we were told all the way through."
"I think the thing is, at the minute, there's no clear information and obviously, we've lost a lot of money, haven't we?" he added.
Mr Paul said they had a river cruise in Paris and the Eiffel Tower booked for this evening, adding: "We'll have to put romance on hold for a while."
A record-high 19.5 million passengers travelled on Eurostar last year, up nearly 5% on 2023, driven by demand from visitors to the Olympics and Paralympics in Paris.
Eurostar has held a monopoly on passenger services through the tunnel linking Britain and France since it opened in 1994.
But British entrepreneur Richard Branson - the man behind the Virgin airline - has vowed to launch a rival service. Italy's Trenitalia has also said it intends to compete with Eurostar on the Paris-London route by 2029.
