PARIS, Dec. 7 (Xinhua) -- The nationwide strike in France caused weekend travel turmoil on Saturday, with unions warning the walkouts would last well into next week.

French Prime Minister Edouard Philippe on Friday justified a plan to overhaul pension regime, which triggered massive protests, but promised a social dialogue.

Police officers stand guard during a demonstration in Paris, France. (Photo by Zi Yang/Xinhua)

Police stand guard during the strike in Paris, France. (Photo by Aurelien Morissard/Xinhua)

A closed metro station due to the strike in Paris, France. (Photo by Aurelien Morissard/Xinhua)

A closed metro station due to the strike in Paris, France. (Photo by Aurelien Morissard/Xinhua)

A destroyed traffic light during the demonstration in Paris, France. (Photo by Zi Yang/Xinhua)

People take part in a demonstration in Paris, France. (Photo by Zi Yang/Xinhua)

Police stand guard during a demonstration in Paris, France. (Photo by Yu Zhou/Xinhua)

People take part in a demonstration in Paris, France. (Photo by Yu Zhou/Xinhua)

A woman takes part in a demonstration in Paris, France. (Photo by Yu Zhou/Xinhua)

People take part in a demonstration in Paris, France. (Photo by Yu Zhou/Xinhua)

People take part in a demonstration in Paris, France. (Photo by Yu Zhou/Xinhua)

People take part in a demonstration in Paris, France. (Photo by Yu Zhou/Xinhua)■