Eurostar passengers are facing delays and train cancellations after an unexploded World War II bomb was discovered in Paris.
The bomb was found during engineering work taking place in the area north of Gare du Nord, a railway station served by the Eurostar.
As a result, five trains between London and Paris have been cancelled, one will be diverted and others are expected to be delayed.
Roads and domestic train services in Paris will also be disrupted while bomb disposal experts work to deactivate the device.
Eurostar said in a statement: "We are sorry for the impact this will have on our customers and would strongly advise anyone scheduled to travel with us between London and Paris this weekend to consider changing their plans."
Free refunds or exchanges are being offered for all passengers booked to travel on Friday, Saturday or Sunday.