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Welcome back to "new day." we are live in d.c. this morning. tuesday, september 17th. in front of the washington navy shipyard, the site of yesterdays shooting. 12 people dead, 8 injured in what amounts to the single deadliest event in washington, d.c. since the plane crash in 1982. how is the see coping with this tragedy? what do we know about the first responders? for great insight we have washington d.c.s mayor, mr. vincent gray. thank you very much. >> glad to be here. >> we know theres a lo...