More than 15,000 residents of Marseille confined to their homes have been allowed out after a wildfire on the outskirts of France’s second city was brought under control, but officials have warned the country faces an exceptionally high-risk summer. Fanned by gale-force winds and kindled by parched vegetation, several fires have burned swathes of southern France in recent days, including Tuesday’s just north of the port city. The weather service has said the weeks ahead could be critical. “The fire is receding, but with a blaze this severe, over this big an area, it’s clear there may be fresh flare-ups, flames can jump, embers can reignite,” the prefect of the Bouches-du-Rhône department, Georges-François Leclerc, said on Wednesday.