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First responders at Navy Yard

Emergency responders arrive at the scene of a shooting at the Washington Navy Yard in Washington, Sept. 16. Several people were killed and others injured when at least one gunman opened fire at the U.S. Navy Yard in Washington D.C. on Monday, authorities said. One Navy official said that four people had died and eight others were injured, but other officials suggested caution over those numbers saying the situation was in flux. REUTERS/Jason Reed (UNITED STATES - Tags: CRIME LAW MILITARY)Jason Reed/Reuters