A Thornton police officer was injured during a violent confrontation with a suspect in a residential neighborhood on Sunday night, October 11, 2026. The incident began around 9:30 p.m. when officers responded to a call regarding an unwanted person in the 12800 block of Ulster Street, near the Adams County Fairgrounds. According to the Thornton Police Department, the suspect, identified as 37-year-old Luis Arebalo, fired multiple shots at the responding officers while they were speaking with the individual who had reported the disturbance. During the exchange, one officer was struck by gunfire but is expected to survive. The other officer returned fire, though it remains unclear if any projectiles struck Arebalo. Following the shooting, Arebalo fled the scene and remained at large as of early Monday morning. Police have not yet apprehended the suspect, and he is currently considered a wanted individual. Residents in the immediate vicinity were initially ordered to shelter in place while officers conducted an extensive search of the area, but that restriction has since been lifted. Authorities are urging the public to remain vigilant and to call 911 immediately if they spot Arebalo. Records indicate that Arebalo has a prior criminal history in Colorado, including a guilty plea for reckless driving in November 2024, though details of that case were not immediately available. Investigators continue to seek information from the public to locate and arrest the suspect. Anyone with information regarding his whereabouts is encouraged to contact law enforcement or submit tips through the appropriate channels.