Eurostar trains to London and all trains heading to northern France were brought to a halt Friday following the discovery of an unexploded bomb dating back to World War II near the tracks.
France's national train operator SNCF said in a statement that traffic would be stopped at the Gare du Nord until mid-morning at the request of police.
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“We invite travellers to postpone their trip,” it said.
The Gare du Nord is a major European transit hub, serving international destinations north of France as well as the main Paris airport and many regional commuters.
Bombs left over from World War I or World War II are regularly discovered around France but it is very rare to find them in such a people-packed location.