Eurotunnel passenger services have resumed but freight trains remain suspended after more than 100 migrants broke into its Calais terminal.
Delays were expected on its passenger trains between Folkestone and Calais.
Trains stopped from 23:30 BST on Friday after staff were shoved and stones were thrown when an organised group of 200 migrants tried to enter the terminal.
Meanwhile, Eurostar passenger services are running as normal from St Pancras, Ashford and Ebbsfleet.
The company said its customers should check-in as normal.
A large group of migrants “arrived together an in a well-organised manner and broke through the fences” at about 23:30 BST on Friday, a Eurotunnel spokesperson said.
Of the group of about 200, 100 successfully broke into the terminal and some managed to get into the tunnel itself.
One Eurotunnel employee and two police officers were injured.
Services were suspended for safety reasons while French police and British authorities removed people from the area.
It would take time to return to a full train schedule, Eurotunnel said on Twitter. It said passengers cannot use their tickets on ferries during the disruption.
A man died on Wednesday near the tunnel entrance in Calais – the 13th migrant to die trying to reach the UK since late June and the fourth to have died in September.
He was the fourth person to have died in similar circumstances in September.
The situation in Calais is part of a wider migrant crisis across Europe, with huge numbers of people heading north from the Mediterranean.
In August, Eurotunnel said the number of attempts by migrants trying to get into its terminal near Calais had fallen to about 150 a night, down from a high of 2,000 in the previous month.
Extra security, including fencing, paid for by the UK, has been put in place, aimed at making it harder for migrants to get onto the platforms and trains.