Greeley police say an armed suspect is dead after an eight-hour standoff on Sunday.

Officers responded around 8:30 in the morning to a home on the 4700 block of 29th Street, after a woman reported that a man had assaulted her inside the residence with a shotgun. She was able to escape before officers arrived. Police have not released the relationship between the woman and the suspect.

Around 9 a.m., authorities ordered a shelter-in-place for a three-block radius. The department’s Crisis Negotiation Unit tried for hours to communicate with the man, who had barricaded himself in the home. At some point, negotiators say he stopped responding altogether.

By late afternoon, around 5 p.m., the Greeley SWAT team entered the residence. Inside, they found the 53-year-old suspect dead from what investigators say was a self-inflicted gunshot wound.

The Weld County Coroner’s Office will identify the man once its investigation is complete. Police say no officers or nearby residents were injured during the incident, and the shelter-in-place order has since been lifted.

The assault report and subsequent standoff remain under investigation.