By Peter Allen In Paris and Emer Scully For Mailonline
Published: 09:23 GMT, 18 March 2019 | Updated: 09:23 GMT, 18 March 2019
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Eurostar cancelled their high-speed trains to Paris from London for three more days today as industrial action by French customs officials reaches its third week.
Passengers should only use high-speed trains from Paris to London 'if absolutely necessary' due to delays of up to five hours caused by industrial action.
Trade unionists have used the threat of Brexit to campaign for better pay and conditions and strikes are set to continue until tomorrow.
Travellers queue at the Eurostar terminal in London's St Pancras last week as militant French trade unionists used Brexit as an excuse for industrial action
This morning delays on services from Paris are delayed from between 45 minutes and an hour, according to a Eurostar spokesman.
The spokesman said: 'French customs officers at Paris Gare du Nord continue to take part in industrial action.
'As a result, the regular pre-departure security checks are taking longer than usual and this is causing delays on departure in Paris.
'We are very sorry for the inconvenience this is causing passengers, and to provide as much flexibility as possible we are offering a free exchange or refund to
