It is clarified that unknown persons in black masks began to set fire to the garbage about an hour and a half after the start of the procession.
Some people throw flares along with it.
According to the agency, young people also break city property, in particular - one person climbed onto a lamppost and smashed a video surveillance camera with a hammer.
Police fired tear gas on the violent protesters.
Riots in other cities in France, where demonstrations are also taking place, have not yet been reported.
Earlier in Warsaw, opponents of toughening abortion laws came out to a rally.