Four people were dead including the gunman following a hostage-taking incident on Saturday in Aurora, Colorado, the same town where a man shot dead 12 people and wounded 58 more at a movie theater last July, KUSA television reported.
Police entered the home after several hours of failed negotiations with the gunman, who had barricaded himself inside, and shot him dead, the television news reported. Inside they found three other people shot dead, KUSA reported.
Police reached by telephone in Aurora offered no immediate information on the situation.
Police notified neighbors of an emergency around 3 a.m. (1000 GMT) and evacuated several blocks, Aurora police spokeswoman Cassidee Carlson told KUSA.
One person inside had escaped and alerted authorities, KUSA said.