All Eurostar services between London and Brussels have been cancelled following attacks at the Belgian capital's airport and a Metro station.
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Eurostar, which runs a high-speed railway service through the Channel Tunnel from London across Europe, announced that it was suspending all trains to or from Brussels.
In a tweet, the company said anyone who had booked a train for today should not travel and would be able to postpone their travel.
Trains to Belgium arrive in the Midi or Zuid station, called Brussels-South in English. It is these which have been cancelled.
The decision follows dozens of people being killed at Brussels Airport in two explosions and a further blast at the Maalbeek Metro station.
At least 20 people have been killed, according to reports, in the bomb attacks which exploded at the departures area of the airport at just after 8am local time and the Metro station one hour later.
The people responsible for the bombings have not yet been confirmed.
Eurostar runs services connecting London with Avignon, Brussels, Lille, Lyon, Marseille and Paris, with all trains passing through the Channel Tunnel between the United Kingdom and France.
