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All Eurostar services between London and Brussels have been cancelled following attacks at the Belgian capital's airport and a Metro station.
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.
Brussels airport explosion 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.
Show all 30 1 /30In pictures: Terror attacks at Brussels metro station In pictures: Terror attacks at Brussels metro station A private security guard helps a wounded women outside the Maalbeek metro station in Brussels
In pictures: Terror attacks at Brussels metro station
In pictures: Terror attacks at Brussels metro station Wounded people receive assistance by rescuers outside the Maalbeek metro station in Brussels
In pictures: Terror attacks at Brussels metro station Rescue workers treat victims outside the Maelbeek underground station
In pictures: Terror attacks at Brussels metro station Passengers waiting to be evacuated from the train between Arts-Lois and Maelbeek
In pictures: Terror attacks at Brussels metro station
In pictures: Terror attacks at Brussels metro station
In pictures: Terror attacks at Brussels metro station
In pictures: Terror attacks at Brussels metro station Emergency services and police work around a metro station after an explosion in Brussels
In pictures: Terror attacks at Brussels metro station
In pictures: Terror attacks at Brussels metro station Rescue teams evacuate wounded people outside the Maalbeek metro station in Brussels
In pictures: Terror attacks at Brussels metro station A woman is evacuated in an ambulance by emergency services after a explosion in a main metro station in Brussels
In pictures: Terror attacks at Brussels metro station A Belgian soldier stands guard outside the Maalbeek metro station in Brussels after a blast at this station located near the EU institutions
In pictures: Terror attacks at Brussels metro station Belgian police officers stand outside the Maalbeek metro station in Brussels
In pictures: Terror attacks at Brussels metro station Belgian policemen and a soldier carrying an injured person after an explosion at the Maelbeek Metro station in Brussels
In pictures: Terror attacks at Brussels metro station A view of the train after the explosion in Maelbeek station in Brussels
In pictures: Terror attacks at Brussels metro station People receive treatment as emergency services attend the scene after an explosion in a main metro station in Brussels
In pictures: Terror attacks at Brussels metro station Maelbeek Metro station after an explosion on a train in Brussels
In pictures: Terror attacks at Brussels metro station Passengers walk on underground metro tracks to be evacuated after an explosion at Maelbeek train station in Brussels
In pictures: Terror attacks at Brussels metro station A victim receives first aid by rescuers, near Maalbeek metro station in Brussels
In pictures: Terror attacks at Brussels metro station Firefighters arrive at the scene near Maalbeek metro station
In pictures: Terror attacks at Brussels metro station Emergency workers arrive at a security perimeter set near Maalbeek metro station in Brussels
In pictures: Terror attacks at Brussels metro station Emergency rescue workers stretcher an unidentified person at the site of an explosion at a metro station in Brussels
AP
In pictures: Terror attacks at Brussels metro station Police seal off the area at the scene of a blast outside a metro station in Brussels
Reuters
In pictures: Terror attacks at Brussels metro station Emergency personnel are seen at the scene of a blast outside a metro station in Brussels
In pictures: Terror attacks at Brussels metro station Emergency personnel are seen at the scene of a blast outside a metro station in Brussels
Reuters
In pictures: Terror attacks at Brussels metro station Belgian police and emergency staff arriving in the Wetstraat - Rue de la Loi, which has been evacuated after an explosion at the Maelbeek metro station in Brussels
In pictures: Terror attacks at Brussels metro station Smoke rising from the Maalbeek underground, in Brussels, following a blast at the station close to the capital's European quarter
Getty Images
In pictures: Terror attacks at Brussels metro station People are evacuated from the Schuman station in Brussels
In pictures: Terror attacks at Brussels metro station The scene outside the Maalbeek underground in Brussels after the explosion
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.
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