President Emmanuel Macron considered declaring a state of emergency as he met security chiefs on Sunday seeking a way out of nationwide protests after rioters turned central Paris into a battle zone and vandalized the Arc de Triomphe monument.

Riot police on Saturday were overwhelmed as protesters ran amok in Paris' posh neighborhoods, torching dozens of cars, looting boutiques and smashing up luxury private homes and cafes in the worst disturbances the capital has seen since 1968.

The unrest poses the most formidable challenge yet to Macron's presidency, with the escalating violence and depth of public anger against his economic reforms catching the 40-year-old leader off-guard and battling to regain control.