The deactivation of a Second World War bomb recently discovered in Paris will cause major disruption to Eurostar services on Sunday.
Five trains between London and the French capital have been cancelled, one will be diverted and others are expected to be delayed.
The unexploded bomb was discovered during engineering work in the area north of Gare du Nord, which is a railway station served by Eurostar.
In a tweet Eurostar advised customers to postpone their journey due to the reduced number of trains running.
Roads and domestic train services in Paris will also be disrupted while the operation to make the device safe is carried out.
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.