One of the people witnesses to a mass shooting in a Denver suburb says the shooter "looked like an assassin ready to go to war."

Nineteen-year-old Jordan Crofter, of Aurora, was sitting on the left side of the theater and toward the front when the door swung open and a silhouette appeared in front of the street lights.

He says the shooter was calm and almost strutted in, then pulled up his rifle and started shooting, stopping only to reload - like "shooting fish in a barrel."

Crofter says he was the first one in the lobby and when the manager asked what was going on, he yelled, "Bomb."