Passengers trying to cross the channel are facing disruption again as services are delayed after being briefly suspended due to "migrant activity" in Calais.
Eurotunnel confirmed shortly before midnight that they had suspended services on both sides of the channel, but around 20 minutes later said they were resuming, subject to delays.
The operator tweeted: "Please be assured we always work hard to maintain the highest levels of security at our Calais terminal.
It added: "Please be aware it will take time to return the service to normal as it's a busy day. We're working hard to reduce the waiting time."
It said French authorities are dealing with migrant activity at the French terminal.
Migrants invading the Eurotunnel terminal in Coquelles has become a nightly occurrence.
The migrant crisis in Calais, wildcat strike action by ferry workers and protesting farmers mean truckers are spending hours stuck in queues in Kent and northern France.
There were delays to the service on Thursday when the body of a suspected migrant was found on the roof of a Eurotunnel train at the Chunnel terminal in Folkestone.
The news came as video footage emerged apparently showing migrants travelling to Britain on empty freight train carriages.
A number of people are seen in an otherwise empty carriage which arrived in Folkestone earlier this month, in footage from a worker obtained by The Sun.
An estimated 5,000 migrants displaced from countries including Syria, Libya and Eritrea are now believed to be camped in and around Calais.
Freight transport chiefs said Britain's freight industry is losing £750,000 a day because of the huge problems lorry drivers have faced this summer trying to cross the Channel.
Operation Stack - where freight traffic is queued on sections of the M20 when cross-Channel services are disrupted - remains in place, and Kent Police warned it could continue until at least tomorrow.