The Dutch had gathered in large numbers on terraces near the Old Port, under surveillance by French and Dutch law enforcement, noted an AFP photographer.

Projectiles were first fired in their direction, according to the Bouches-du-Rhône police headquarters.

Then Marseille supporters arrived and groups from both sides began to provoke each other.

"The police intervened, on several occasions, very quickly, to separate these small groups, so there were no major disturbances," said the prefecture.

A Dutchman, however, was slightly injured.

Five Marseille supporters were arrested, three for carrying batons, two for carrying fireworks.

For Thursday, a "fan-zone" will be installed on Prado beach, the largest beach in the city, to avoid overflows, while the meeting has been classified "level 5" in terms of security by the authorities, i.e. the maximum level, according to a source familiar with the matter.

Arrest of a supporter in Marseille, on May 4, 2022, on the eve of the match between OM and Feyenoord Christophe SIMON AFP

"It was immediately obvious that a higher level of security was needed than against Thessaloniki," this source told AFP on Tuesday, referring to the incidents in Marseille during the quarter-final against PAOK Salonika.

Some 3,200 Dutch supporters are expected at the Stade Vélodrome on Thursday evening, and 1,000 to 1,500 others in town, without a ticket.

© 2022 AFP