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Ms. Wright said she slid on her belly to the first floor of her home and told police what she saw upstairs. Officers quickly entered her home.

Ms. Wright said she knew the gunman as Sonny Archuleta — a name used by police officers trying to negotiate with the man with the bullhorn. Ms. Wright said the town house may have been inhabited by the gunman, the gunman’s wife, her father and another man.

The shootings occurred about four miles southeast of the Aurora Mall, where 12 people were killed and dozens were wounded by a gunman at a midnight showing of “The Dark Knight Rises” on July 20. The man charged in that shooting, James Holmes, goes to court Monday for a preliminary hearing in which prosecutors will present their case against him.

The July shootings prompted Gov. John Hickenlooper — just before the Newtown, Conn., massacre — to say it is time to debate gun control. It’s expected to be a heated topic at the Colorado Legislature this year.

Aurora, just east of Denver, is one of Colorado’s largest and most diverse cities, with more than 335,000 residents. It is home to Buckley Air Force Base as well as the sprawling University of Colorado Health Sciences Center campus, where James Holmes studied neuroscience before the movie theater shootings.

• Associated Press writer Thomas Peipert contributed to this article.