Investigators are examining whether a natural gas problem or a vehicle fire triggered the blast at a Shell station south of the 6th Avenue freeway.
DENVER, CO — Two people were injured after an explosion and fire ripped through a Shell gas station in Denver late Thursday morning, badly damaging the building near West 5th Avenue and Bryant Street and drawing a heavy emergency response.
Authorities said the blast happened just before noon on March 19 at the station one block south of the 6th Avenue freeway. Fire officials said both injured people were taken to Denver Health with blast and burn injuries. By Thursday evening, investigators from the Denver Fire Department, Denver police and Xcel Energy were still trying to determine whether the explosion began with a natural gas problem, a vehicle fire behind the station, or another cause.
Firefighters arrived to find the entire station building on fire and a vehicle burning on the back side of the property, according to Operations Division Chief Robert Murphy of the Denver Fire Department. Thick smoke could be seen from several blocks away, including near 6th Avenue and Knox Street, as crews moved in to attack the fire and secure the area around the pumps and storefront. Murphy said the two injured people did not appear to have life-threatening wounds when first responders reached them because they were walking before being transported to the hospital. Early reports had suggested a vehicle crashed into the building, but Murphy later said there was no crash into the structure. That shift in the official account changed the focus of the investigation from a possible collision scene to a broader review of fire conditions, gas service and activity behind the building in the minutes before the blast.
Officials said the station itself took the brunt of the damage. Murphy told reporters the building was structurally compromised and likely to collapse inward, which kept firefighters from going inside even after the main flames were brought under control. Instead, crews worked from outside while investigators began piecing together the sequence of events. Fire officials said the two victims suffered what they described as blast and burn injuries, but authorities had not publicly identified them or released details about their ages, roles at the station or exact medical conditions by late Thursday. Investigators were also looking at a vehicle fire reported behind the Shell station shortly before the explosion. At the same time, Murphy said crews were checking with Xcel Energy to see whether a natural gas issue may have played a role. Those possibilities had not been confirmed, and officials had not said whether the blast began inside the building, outside near fuel equipment or in the rear of the property.
The explosion hit a busy corridor just southwest of central Denver, near the junction of surface streets feeding into the 6th Avenue freeway and Interstate 25 area. That location helped explain the speed and size of the response, with police and fire crews moving quickly to block traffic and keep bystanders away from a site where flames, fuel and possible gas hazards created an unstable scene. The Shell station at 5th and Bryant sits close to major commuter routes and commercial blocks, so the fire quickly drew public attention as smoke rose above nearby streets. The blast also came just a year after another high-profile explosion in Denver forced evacuations at an assisted living facility, a reminder of how utility-related emergencies can rapidly turn into large public safety operations in the city. In this case, though, officials stressed that the damage appeared to be contained to the gas station property itself, with no immediate indication Thursday that neighboring buildings had suffered major damage.
By late Thursday, the case remained in its early investigative stage. Fire crews had knocked down the flames, but Murphy said responders would remain at the scene for an extended period because of the danger posed by the damaged structure. Investigators still needed to determine the origin point of the fire, inspect utility connections, document the burned vehicle behind the building and review witness accounts and any available surveillance footage. Authorities had not announced any criminal allegations, code violations or enforcement action, and there was no public timeline for when the site would be safe for a full interior examination. Officials also had not said when the Shell station might reopen, if at all, or whether fuel service equipment at the location would need to be removed or replaced. Any formal finding on the cause is likely to depend on fire scene analysis, utility testing and structural safety assessments completed after the site is stabilized.
At the scene, the most striking details were the blackened shell of the building and the uncertainty that followed the initial blast. Murphy described an “explosion of some sort” when crews first updated the public, reflecting how little was settled in the first hours after the fire. Witnesses in the area reported seeing a column of smoke and a large emergency response converging near the station as noon traffic moved through surrounding streets. The visible damage supported officials’ warning that the structure could not be safely entered. Even after the flames were controlled, the station remained a place of caution rather than cleanup, with crews holding the perimeter while investigators worked from outside. The two injuries, the destroyed building and the unanswered question of what ignited the blast made the site one of Denver’s most closely watched emergency scenes Thursday afternoon.
As of Thursday night, two people were hospitalized, the Shell station remained heavily damaged and the cause of the explosion had not been determined. The next milestone is expected to come after investigators finish a more detailed scene examination and officials provide another public update on the cause and the condition of the injured.
Author note: Last updated March 20, 2026.