Four people are dead, including the gunman, following a hostage-taking incident on Saturday in Aurora, Colorado.
It is the same town where a man shot dead 12 people and wounded 58 more at a movie theatre last July.
Police entered the home after several hours of failed negotiations with the gunman, who had barricaded himself inside.
They eventually forced their way in and shot him dead before discovering the bodies of three other people.
It is reported one person inside the house managed to escape and alerted police.
Neighbours were told there was an emergency at around 3am local time and officers evacuated several buildings close to the scene.