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Services through the Channel Tunnel have been disrupted after a problem on a Eurotunnel shuttle train.
Kent police said a CO2 sensor had been triggered on a freight train, setting off an emergency procedure in which all people are evacuated.
Eurostar, which runs high-speed trains through the tunnel between London and Paris and Brussels, said services had been suspended for a period.
Lines have since started to reopen, but passengers were told to expect delays.
"The traffic is resuming now, we have received authorisation from Eurotunnel," a Eurostar spokeswoman told AFP news agency. "But we expect a knock-on effect on the schedule."
Services in both directions were halted when an alarm was triggered by a C02 detector in the tunnel shortly after 0700 BST (0800 GMT).
The nearest train, a shuttle carrying 30 lorries and drivers, was evacuated and taken back to the surface on the UK side.
Emergency services from Kent were called, but no fire was reported, a Kent police inspector said.
A Eurotunnel spokeswoman said: "The freight train was travelling towards England and was more than half-way through the tunnel when it was stopped. Emergency services are trying to work out why the detector went off. We need to understand why it happened."