The man attacked two police officers on patrol at the station, the terminus for trains from London, with a 30-centimetre (12-inch) knife with ACAB (All Cops Are Bastards) written on the blade, said a police source, who asked not be named.
Officers forced the migrants to leave before workers started hauling down tents and bivouacs near Loon Beach - a well known launching port for small dinghies favoured by smuggling gangs.
French Interior Minister Gerald Darmanin claiumed that none of the £54million that Home Secretary Priti Patel had promised Paris to tackle the surge of migrants crossing the Channel has been paid.
Eurostar requires all passengers to wear a mask at all times onboard but a spokesman today said that there were no rules specifying what type of masks must be worn.