CNN - (CNN) ? Outer bands of the unusually powerful Hurricane Irma battered parts of the Dominican Republic and Haiti on Thursday morning, threatening serious flooding a day after leaving severe destruction and at least nine dead across a string of Caribbean islands to the east. Irma ? a Category 5 storm that has kept sustained winds of 180 mph longer than any other on record ? knocked out electricity a day earlier to more than 1 million customers in Puerto Rico
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