"They want to deport almost 50 people including women who did not take part in anything," Shprygin, president of the Russian Supporters Union, told Reuters by phone.
"The police are making up for their mistakes three days ago. We are in a bus in Cannes and we have been blocked in by riot police. We are not going anywhere for the time being."
Read also150 Russians 'behind' Euro 2016 violence - BBCHe later said the Russian consul had arrived on the scene, preventing what he said was a planned storming of the bus by the police.
There was no immediate comment from French authorities, who have said about 150 hard-core Russian fans took part in serious violence after Saturday's clashes around the England-Russia game in Marseille at the Euro 2016 tournament.
European soccer's governing body, UEFA, has threatened to expel the Russian and English teams from the championship if the violence persists.
