Washington Navy Yard shooting
The Washington Navy Yard shooting occurred on September 16 , 2013 when 34-year-old Aaron Alexis fatally shot 12 people and injured three others in a mass shooting at the headquarters of the Naval Sea Systems Command ( NAVSEA ) inside the Washington Navy Yard in southeast Washington , D . C . 
<triplet> Washington Navy Yard shooting <subj> September 16, 2013 <obj> point in time <subj> Washington Navy Yard <obj> location <triplet> Naval Sea Systems Command <subj> Washington Navy Yard <obj> headquarters location <triplet> Washington Navy Yard <subj> Washington Navy Yard shooting <obj> significant event