Protests are expected across France on Saturday as opponents of far-right presidential candidate Marine Le Pen seek to form a united front to prevent her from winning an election runoff against incumbent Emmanuel Macron on April 24.
Police have warned of possible incidents as demonstrators convene in some 30 cities.
Macron, a pro-European Union centrist, won the presidency in 2017 after easily beating Le Pen when voters rallied behind him in the runoff to keep the far right out of power.