Sections of the Channel Tunnel were closed this morning due to trespassers on a Eurotunnel shuttle.
Eurostar and Le Shuttle services were both affected.
Eurotunnel said: “Our passenger service is currently operating with some timetable disruption. This is due to an incident in the tunnel which is in the process of being resolved.
“There is a waiting time of approximately 90 minutes. We sincerely apologise for the inconvenience this will cause to your journey.”
Eurostar said that delays would affect its trains between London and Paris and Brussels.
No details of who was involved in the trespass were given.
Channel Tunnel and cross-Channel ferry services have been disrupted for the past two weeks in an ongoing dispute over the sale of Eurotunnel-owned MyFerryLink to rival DFDS Seaways.