A fire swept through a 13-story office building in downtown Rio de Janeiro, killing at least 14 people and forcing hundreds to flee, authorities said. Three people trying to escape the flames jumped 10 floors to their deaths. The other dead were reported burned or asphyxiated inside the building. About 40 people were rushed to Souza Aguiar Hospital, some with "very serious" burns, a spokesman said. Fire officials, hampered by smoke and darkness, planned to resume the search for victims this morning. The cause of the fire has not been determined.