Prosecutor: 150 Russians came to Marseille to cause trouble

French police officers charge soccer supporters during clashes in downtown Marseille, France, Saturday, June 11, 2016. Riot police have thrown tear gas canisters at soccer fans Saturday in Marseille's Old Port in a third straight day of violence in the city. (AP Photo/Darko Bandic) (The Associated Press)

Chris Booth speaks to the media at Marseilles Court, France, on Monday June 13, 2016, after his son, Alex Booth, was jailed for two months and banned from entering France for two years. Two English soccer fans, Alex Booth and Ian Hedworth, were convicted by a French court on Monday of involvement in rioting and sentenced to two and three months in prison. (Niall Carson/PA via AP) UNITED KINGDOM OUT (The Associated Press)

Chris Booth speaks to the media at Marseilles Court, France, on Monday June 13, 2016, after his son, Alex Booth, was jailed for two months and banned from entering France for two years. Two English soccer fans, Alex Booth and Ian Hedworth, were convicted by a French court on Monday of involvement in rioting and sentenced to two and three months in prison. (Niall Carson/PA via AP) UNITED KINGDOM OUT (The Associated Press)

Marseille prosecutor Brice Robin says 150 specially trained Russian hooligans were behind much of the violence that broke out in Marseille ahead of the England-Russia game on Saturday.

Robin spoke after a weekend of violence in the French port city ahead of the European Championship soccer game on Saturday, which ended in a 1-1 draw.

About 35 people have been injured, including four people whose conditions were described as serious. Robin told reporters Monday that while "almost of those who were wounded were British," England supporters were also responsible for some of the violence.

He said 20 people have been arrested. Ten of them — six Brits, an Austrian and three French — will face immediate trial.