Rioters set fire to a bank and ransacked stores on Paris's Champs Elysees avenue on Saturday in a new flare-up of violence as France's yellow vest protests against President Emmanuel Macron and his pro-business reforms entered a fourth month.

Police fired tear gas and water cannon as the protests turned violent after weeks of relative calm, during which marches had attracted declining numbers of participants.

A Banque Tarneaud branch spewed flames before firefighters arrived and rescued a woman and her infant from the building, with 11 suffering minor injuries, the fire department said.