Justin Jouvenal Rachel Chason Paul Duggan The Washington Post

Mike Carre's work day had barely begun Thursday at a complex of sprawling warehouses in Maryland when a man he didn't know staggered into his office, bleeding from a bullet hole above his left knee. "There's a shooting at Rite Aid!" the man blurted, before Carre and others helped him into a chair.

Mike Carre's work day had barely begun Thursday at a complex of sprawling warehouses in Maryland when a man he didn't know staggered into his office, bleeding from a bullet hole above his left knee. "There's a shooting at Rite Aid!" the man blurted, before Carre and others helped him into a chair.