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A freight train passing through the channel tunnel was forced to stop after a person trying to reach the UK was spotted on one of the wagons.
The stopping of the train resulted in long delays for the service , on both sides of the channel.
Eurotunnel said that the train stopped near to the tunnel entrance on the Calais side, and added that several people were found after a search by police.
Eurotunnel did not specify how many people they found, and said they had been sent back to France.
People stand near the side of the road in Calais, close to the large camp nearby (REGIS DUVIGNAU/Reuters) A spokesman said: "A suspicion of migrants on a freight train led us to stop and search the train."
"We decided to stop it just at the entrance to the tunnel."
Eurotunnel said they would try to get services back to normal after the unscheduled stop, but the BBC reported that travellers from Dover were faced with an hour-long wait before check-in and a three-hour wait after that.
Show all 20 1 /20In pictures: Calais crisis intensifies In pictures: Calais crisis intensifies Calais crisis French gendarmes try to stop migrants on the Eurotunnel site in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis French gendarmes try to stop migrants on the Eurotunnel site in Coquelles near Calais
Getty Images
In pictures: Calais crisis intensifies Calais crisis A migrant climbs a security fence of a Eurotunnel terminal in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis A migrant climbs a security fence of a Eurotunnel terminal in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis French gendarmes block migrants along a road to prevent them access to train tracks which lead to the Channel Tunnel in Frethun, near Calais
In pictures: Calais crisis intensifies Calais crisis Policemen try to prevent migrants from reaching the Channel Tunnel operated by Eurotunnel in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis A policeman faces migrants trying to reach the Channel Tunnel operated by Eurotunnel in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis A policeman tries to stop migrants on the Eurotunnel site in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis Migrants who managed to pass the police block on the Eurotunnel site climb over a fence to make their way towards the boarding docks in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis Migrants are seen near a Channel Tunnel train in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis Migrants trying to reach the Channel Tunnel run past policemen in Coquelles near Calaisa
In pictures: Calais crisis intensifies Calais crisis Migrants step over the fence as they try to catch a train to reach England, in Calais
In pictures: Calais crisis intensifies Calais crisis A migrant climbs a security fence of a Eurotunnel terminal in Coquelles near Calais
In pictures: Calais crisis intensifies Calais crisis Migrants warm themselves with a fire as they attempt to access the Channel Tunnel, in Calais
In pictures: Calais crisis intensifies Calais crisis An Afghan flag flies above makeshift shelters at a site dubbed the "new jungle", where migrants trying to cross the Channel to reach Britain have camped out around the northern French port of Calais
In pictures: Calais crisis intensifies Calais crisis Migrants build a makeshift shelter around the northern French port of Calais
In pictures: Calais crisis intensifies Calais crisis Migrants build a makeshift shelter
In pictures: Calais crisis intensifies Calais crisis Migrants walk in a makeshift camp in Calais
In pictures: Calais crisis intensifies Calais crisis A driver climbs on his truck as he waits to cross the English channel, in Calais
In pictures: Calais crisis intensifies Calais crisis Migrants walk along the roadside while a French policeman secures the area as lorries queue in Calais
The waiting time for lorry drivers was said to be around five hours.
Eurostar services were delayed, a travellers in France were being turned away if they did not have reservations.
On 6 August, a man was arrested by Kent police near the tunnel's exit in Folkestone, after having apparently walked the tunnel's entire 31 mile length from Calais.
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