Isaac passes Haiti, heads toward Cuba, Florida

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)Tropical Storm Isaac swept across Haiti's southern peninsula early Saturday, dousing a capital city prone to flooding and areas of the poor nation still trying to recover from the terrible 2010 earthquake. USA, LLC