Four people were killed and 29 others were taken to hospital after a pileup involving more than 30 vehicles on Interstate 25 south of Pueblo, Colorado, according to Times Now. The crash involved six semi-trucks and more than two dozen passenger vehicles and forced the highway to shut down in both directions, turning a single collision into a major regional traffic emergency.

Colorado State Patrol said the crash investigation found that more than 30 vehicles were involved and that 29 people had been transported to hospital, though the extent of their injuries was not immediately known. The scale matters because it shows how quickly a dust-driven visibility problem can cascade across lanes of traffic when large vehicles and passenger cars are all on the same stretch of road.

Hospital systems had to respond at once. UCHealth said it opened its incident command center and treated at least 12 patients, while officials urged motorists to avoid the area entirely. With northbound lanes closed at milepost 93 and southbound lanes closed at milepost 94, there was no immediate estimate for reopening, and local police said it would be a very long time before normal traffic could resume.

Weather appears to have played a role. Authorities warned of low visibility and advised drivers to delay travel until conditions improved, while a Colorado Department of Transportation spokesperson said dust and high winds may have created near-brownout conditions. That detail does not establish a final cause, but it does explain why a crash like this can spread so rapidly across so many vehicles in a short period of time.

The investigation is now in the hands of the state patrol’s Vehicular Crimes Unit, which will have to sort out how the chain reaction began and whether speed, spacing or weather played the bigger role. For now, the facts are grim enough on their own: a multi-vehicle crash, four dead, 29 in hospital and a highway closed by a storm of dust, steel and confusion.

The crash also shows how quickly weather can turn a highway into a multi-agency emergency. Dust, high winds and low visibility are difficult conditions for any driver, but they are especially dangerous when semis and passenger cars are mixed together at speed. With the investigation still open, the important thing for officials is not just determining fault, but explaining how to prevent the same kind of pileup when the weather shifts again.