The Channel Tunnel has been closed until further notice this afternoon following a lorry fire.
Passengers are facing disruption following the blaze that has cancelled all its services for Saturday.
Eurotar has told people expecting to travel to postpone their journeys and not go to the station.
Kent Police said the fire happened at the French end of the tunnel and that no-one was hurt in the incident.
The spokesman said the fire had led to the closure of both tunnels, and that there are currently no trains in either.
The lorry is being recovered and the fire was being dealt with by the French authorities, he added.
"Rail passengers are advised to expect significant delays whilst the vehicle is being recovered and fumes are cleared from the tunnels," the spokesman said.
Eurostar said in a statement: "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."
John O'Keefe, a spokesman for Eurotunnel which transports freight through the Channel Tunnel, said inspectors were sent into the tunnel after two smoke alarms had been triggered.
"The investigation into the two alarms is going on at the moment so as soon we know more we'll let [everyone] know."
Eurotunnel also said that passengers on a Calais to Dover train were evacuated from the Channel Tunnel "without incident", following the smoke alert.
