France hunkered down for another wave of potentially violent protests on Saturday as embattled President Emmanuel Macron planned to address the nation next week over public fury at the high cost of living, senior allies said.

Interior Minister Christophe Castaner said the three-week-old “yellow vest” revolt had “created a monster” and vowed police would have no tolerance for violence, with much of Paris in lockdown and tens of thousands of police deployed nationwide.

Named after the fluorescent safety vests that all French motorists must carry, the protesters are billing their planned action on Saturday as “Act IV” of worst unrest seen in the capital since the 1968 student riots.