People run over a bridge covered by debris as waves hit the seawall, caused by Tropical Storm Isaac in Barahona, Dominican Republic, Friday, Aug. 24, 2012. Tropical Storm Isaac strengthened slightly as it spun toward the Dominican Republic and vulnerable Haiti on Friday, threatening to bring punishing rains but unlikely to gain enough steam to strike as a hurricane. (AP Photo/Ricardo Arduengo)

Associated Press
People run over a bridge covered by debris as waves hit the seawall, caused by Tropical Storm Isaac in Barahona, Dominican Republic, Friday, Aug. 24, 2012. Tropical Storm Isaac strengthened slightly as it spun toward the Dominican Republic and vulnerable Haiti on Friday, threatening to bring punishing rains but unlikely to gain enough steam to strike as a hurricane. (AP Photo/Ricardo Arduengo)
People run over a bridge covered by debris as waves hit the seawall, caused by Tropical Storm Isaac in Barahona, Dominican Republic, Friday, Aug. 24, 2012. Tropical Storm Isaac strengthened slightly as it spun toward the Dominican Republic and vulnerable Haiti on Friday, threatening to bring punishing rains but unlikely to gain enough steam to strike as a hurricane. (AP Photo/Ricardo Arduengo)
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