A Thornton, Colorado police officer was shot and seriously wounded late Sunday night, October 11, 2026, after officers responded to a report of an unwanted person in a residential neighborhood near the Adams County Fairgrounds. Police say 37-year-old Luis Arebalo opened fire on officers as they spoke with the person who called for help, striking one officer before fleeing the scene and triggering a multi-day manhunt.
TL;DR: Thornton officers answering a 9:33 p.m. “unwanted person” call in the 12800 block of Ulster Street came under gunfire Sunday night, and one officer was seriously wounded. Police identified the alleged gunman as Luis Arebalo, 37, who fled and was considered armed and dangerous, prompting a shelter-in-place order and a wide search. The wounded officer has since been released from the hospital and is expected to make a full recovery. On October 14, FOX31 Denver reported that the suspect was taken into custody.
How the Shooting Unfolded
Thornton officers were dispatched around 9:33 p.m. Sunday to the 12800 block of Ulster Street, near East 128th Avenue and the Adams County Fairgrounds, on a report of an unwanted person, according to a Thornton Police Department news release reported by the Northglenn-Thornton Sentinel. While officers were on scene speaking with the person who made the report, police allege that Arebalo fired multiple rounds at them.
One officer was struck and transported to an area hospital with serious but non-life-threatening injuries, the department said. A second Thornton officer returned fire during the incident. Investigators have not determined whether Arebalo was hit by the officer’s gunfire, police said.
Shelter-in-Place and the Search
Police immediately asked residents in the neighborhood to shelter in place and mounted a large search that stretched for several hours before the restriction was lifted. Arebalo fled the scene and had not been apprehended by early Monday morning, the department said.
Authorities described Arebalo as 5 feet 9 inches tall and about 180 pounds, with brown hair and brown eyes, last seen wearing a black short-sleeved shirt and dark-colored pants. Police warned that he was considered armed and dangerous and urged the public not to approach him but to call 911 with any sighting, the Denver Post reported.
The manhunt continued into Monday and Tuesday, with Denver-area outlets including N’Cuffs, CBS Colorado and 9NEWS following the search as investigators worked to track Arebalo down.
Officer Out of the Hospital
The wounded officer was later released from the hospital and is expected to make a full recovery, according to 9NEWS. The department has not publicly released the officer’s name.
Suspect Reported Taken Into Custody
On Wednesday, October 14, FOX31 Denver (KDVR) reported that the man accused of shooting the Thornton police officer was taken into custody. Further details about where and how he was apprehended had not been publicly released at the time of this article’s publication.
What Comes Next
The case remains under investigation, and formal charges had not been announced at the time of publication. Colorado court records show Arebalo previously pleaded guilty to reckless driving in connection with a November 2024 incident, according to Officer.com, citing the Denver Post.
Frequently Asked Questions
What happened in Thornton on Sunday night?
Thornton police officers responded to a report of an unwanted person in the 12800 block of Ulster Street around 9:33 p.m. on October 11, 2026. Police say that while officers were speaking with the reporting party, 37-year-old Luis Arebalo fired multiple rounds at them, striking one officer. A second officer returned fire, and the suspect fled.
Where exactly did the shooting take place?
The shooting occurred in the 12800 block of Ulster Street in Thornton, Colorado, near East 128th Avenue and the Adams County Fairgrounds, in a residential neighborhood, according to the Thornton Police Department news release.
Was the wounded officer killed?
No. The officer was taken to an area hospital with serious but non-life-threatening injuries. He has since been released from the hospital and is expected to make a full recovery, according to 9NEWS. The officer’s name has not been publicly released.
Who is the suspect?
Police identified the suspect as Luis Arebalo, 37. He is described as 5 feet 9 inches tall and about 180 pounds, with brown hair and brown eyes. Police said he was considered armed and dangerous while at large.
Has the suspect been caught?
On October 14, FOX31 Denver (KDVR) reported that the man accused of shooting the Thornton police officer was taken into custody. Details of the apprehension had not yet been publicly released. He is now presumed to be in police custody pending formal charges.
Did police order residents to shelter in place?
Yes. Officers asked residents in the neighborhood to shelter in place immediately after the shooting and searched the area for several hours before lifting the restriction, the department said.
Did the officer return fire?
A second Thornton officer did return fire during the incident, according to the department’s news release. Investigators have not determined whether the suspect was struck by the officer’s gunfire.
What could the suspect be charged with?
Formal charges had not been announced at the time of publication. In Colorado, shooting at a police officer can lead to charges such as attempted first-degree murder, assault on a peace officer, and weapons offenses. Any charges would be decided by prosecutors after the investigation, and Arebalo would be presumed innocent until proven guilty.
