CAGUAS, Puerto Rico — Hurricane Fiona was on a track Thursday to menace Bermuda and far-eastern Canada after leaving hundreds of people stranded across Puerto Rico, where it smashed roads and bridges and caused historic flooding.

Government officials have been working with religious groups, nonprofits and others braving landslides, thick mud and broken asphalt by foot to provide food, water and medicine for people in need, but they are under pressure to clear a path so vehicles can enter isolated areas soon.

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