Traffic is building up on the M20 at the Channel Tunnel due to a vehicle fire.
Two lanes are closed on the motorway London bound between J11A at the Channel Tunnel and J11 at Hythe.
One lane remains open.
Eurotunnel has confirmed that a migrant was intercepted inside the Channel Tunnel yesterday .
Eurotunnel's detection systems identified 'an intrusion' near to the Tunnel entrance in France. As soon as the alarm was raised, Eurotunnel closed the French entrance to the Tunnel and police searched the area.
Eurotunnel said: "A criminal intrusion into the Channel Tunnel is an extremely rare incident. It is both illegal and highly dangerous. This person could have been seriously injured or even killed."
Following the detailed search of the Tunnel a Sudanese national was intercepted and arrested by the Channel Tunnel Police. Charges are being pressed.
Full service through the Channel Tunnel resumed in the late afternoon.
The closure of the Port of Calais because of industrial action in France has had a knock-on effect in Kent.
There is queueing traffic and one lane is blocked due to freight traffic queueing for the Channel Tunnel on M20 coastbound at J11A.
At the Channel Tunnel, M20 J11a, the queue is back on to the main M20 in lane one (of three) and the A20 is slow in to Dover.
Tunnel passengers are facing delays after services were suspended for a time when an alarm went off as a freight shuttle train passed through.
Passenger and freight shuttle trains as well as Eurostar high-speed services were halted as technicians checked the France-bound train, which stopped around mid-tunnel.
Border Force officers at the Channel Tunnel entrance in France have seized around 578 boxes of counterfeit cosmetic gift sets with a potential value of up to £10 million.
The seizure was made in the early hours of 28 August as officers carried out checks on a Dutch-registered vehicle en route to a business park in Newcastle-under-Lyme.
The Border Force team inspected the load and it soon became clear that the cosmetic sets and their packaging were of inferior quality.
The goods were seized and the investigation has been passed to Kent County Council Trading Standards.
The Channel Tunnel is celebrating its 20th anniversary today. Exactly 20 years ago the Queen became one of the first passengers to cross from Kent to France by train through the 23 and a half mile tunnel.
The Channel Tunnel is celebrating its 20th anniversary today.
Exactly 20 years ago the Queen became one of the first passengers to cross from Kent to France by train through the 23.5 mile tunnel.
Shuttles transport cars, coaches and lorries between England and France along twin railway tunnels. Eurostar also uses the Channel Tunnel to run high speed rail services from London to Paris and Brussels.
Since opening more than 330 million passengers have used the tunnel, with more than 65 million vehicles, 20 million of those being trucks.
Eurostar has had to cancel six trains today - two from London to Paris, two from Paris to London, one from London to Brussels and one from Brussels to London.
The Channel Tunnel trouble came as millions took to the roads at the start of the holiday, with the weekend likely to see as many as 16 million cars on the move.
Two separate incidents have led to hours-long delays to those taking Folkestone-Calais shuttle trains and high-speed Eurostar services between London and Paris and Brussels via the tunnel.
The first problem came earlier today when a fatality near Lille in northern France involving a French high-speed train resulted in diversions and delays to Eurostar trains.
Then, just as Eurostar services were getting back to normal, a Eurotunnel passenger shuttle train broke down in the tunnel leading to further delays to Eurostar services and long hold-ups of up to four hours for shuttle-train passengers.