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At least 13 people are dead and several others were wounded after a gunman opened fire at the Washington Navy Yard on Monday, police said, spreading fear and chaos across the region as authorities sought to contain the panic. The incident, in which the death toll rose almost hourly, represents the single worst loss of life in the District since an airliner plunged into the Potomac River in 1982, killing 78. D.C. Police Chief Cathy L. Lanier and Mayor Vincent C. Gray announced the mounting number of casualties in a series of news conferences. The suspected shooter, identified by the FBI as Aaron Alexis, 34, living in Fort Worth, is among the 13 dead. Alexis was a military contractor, one official said. But even hours after the rampage began, it was still unclear whether the shooting was the act of a lone gunman, or if other shooters were involved. Lanier initially said authorities were looking for two more potential shooters dressed in military style clothing. But shortly after she announced a detailed description of two suspects, city officials said one had been located and cleared. | 
