London: Traffic was suspended in the Channel Tunnel between Britain and France on Saturday after smoke was detected, according to the Eurotunnel firm that operates it.
"Due to an incident in the tunnel, all departures are currently suspended in both directions," Eurotunnel said on its Twitter feed.
The Eurostar passenger train service said on its website that all services had been cancelled for the day.
"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," the firm said on its website.
"If you were planning to travel today, we advise you to postpone your journey and not to come to the station," Eurostar added.
All trains already en route were forced to turn back to their stations of origin.