A power cut has led to travel disruption for Eurostar passengers heading in and out of St Pancras station.
Services across the channel were cancelled and delayed whilst the issues were fixed with overhead cables.
The Channel Tunnel reopened around lunchtime but the problems persisted throughout Sunday afternoon.
Some people have complained about the lack of information from staff and overcrowding.
In a statement, Eurostar said:
"We’re very sorry for the inconvenience caused by a delay or cancellation to your Eurostar journey. We understand how stressful this can be and we will always try our best to prevent this. If there has been some disruption to your travel plans, you can find out about updates to your journey and options available to you here."