A shooting incident in a shopping district outside of Denver left three persons dead, including a police officer from Colorado, a “Samaritan”, and the suspect, according to authorities.

Based on the statement of Arvada Dep. Chief Ed Brady, a veteran police officer headed near a library in the Olde Town District after a “suspicious incident” was reported. He was shot down around 1:30 p.m.

Brady told a news briefing that 911 calls were made after a while, sending reports of probable gunfire which hit the police officer. Apart from him, there is also a possible bystander struck by the bullet from the gunman, who also succumbed.

There was no information yet regarding the identity of those involved in the shooting.

In a report by KDVR-TV, a Code RED was released  following the shooting. People in the place were ordered to take shelter and report any malicious activity to the authorities.

Investigators think there were no other suspects in the deadly shooting as Brady said the search for suspects in the area has ended.

The news outlet said residents were transferred to safe locations while authorities searched for probable explosives. Business establishments in the area also ended its operations early after the incident.

On Monday evening, a bomb squad was spotted outside a residence but it was unclear whether it has something to do with the shooting.

People paid their respect for the killed police officer through forming a line to the streets for a procession.

Democrat Gov. Jared Polis extended his thoughts to the fallen police officer’s family.

“My thoughts are with the family and friends of the officer who was tragically killed in the line of duty while swiftly and bravely responding to protect civilians in the area,” Polis wrote in a statement.