Eurotunnel will resume Le Shuttle services through the Channel Tunnel this evening following a lorry fire, it said tonight.
Earlier, a blaze at the French end of the tunnel saw all services between London and the Continent cancelled for hours, leaving many trapped in France and others unable to start their trips abroad.
Eurostar said all trains were returning to original stations because the tunnel would be closed until further notice.
In a message posted on its website: "We are sorry but we are unable to run any further trains today because Eurotunnel has been closed due to smoke detected in the north tunnel. If you were planning to travel today, we advise you to postpone your journey and not to come to the station."
However, at 5.30pm it said services would resume.
Kent Police said the smoke was caused by a lorry fire. A spokesman said: "A lorry fire has led to the closure of both bores of the Channel Tunnel.
"The fire was at the French end of the tunnel and is being dealt with by the French authorities. There are no reported injuries.
"However, rail passengers are advised to expect significant delays whilst the vehicle is being recovered and fumes are cleared from the tunnels."
Eurotunnel's @LeShutttle tweeted: "CO2 detectors have been activated in one tunnel; we are currently awaiting feedback from teams in Tunnel. Further info to follow."
In March hundreds of Eurostar passengers were delayed after a lightning strike triggered a fire in a building close to the entrance to the tunnel in Kent.
The latest fire comes as security remains heightened following the fatal terror attacks on satirical magazine Charlie Hebdo and a kosher supermarket in Paris last week.
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