Washington (KTNV) -- As Navy Yard employees get back to work, more details are emerging about the heroes in the tragedy.
It started with a gunman on the loose at the Navy Yard, identified now as Aaron Alexis.
U.S. Park Police helicopters hovered into range, not knowing if someone might fire at them.
From above the building tops, they lowered a rescue basket to tactical police below, and pulled four injured civilians to safety.
When asking one officer how many times he has had to hold a rifle for rescue, he said this was a first.
Then inside the building, on the fourth floor, where the gunman was firing, an eyewitness by the name of John Weaver, saw the gunman shoot first-hand.
When he saw the gunman shoot a woman, he said he ran down the stairs yelling, warning everyone there was a man killing people with a shotgun.