A stretch of Interstate 10 in Tucson, AZ is closed in both directions after a truck carrying hazardous materials overturned, and people within a one-mile radius of the incident have been ordered to evacuate. As of press time, the Arizona Department of Transportation did not have an estimated time for re-opening.

@TucsonFireDept handling a large HAZMAT incident near I-10/Wilmot. Large plume of gas is endangering all traffics.@Arizona_DPS is shutting down I-10 near at Rita and Houghton. pic.twitter.com/F9gJnCjxni

— JD Fitzgerald (@JD_Fotog) February 14, 2023

BREAKING🚨: Truck carrying hazardous materials overturns on I-10 in Tucson, Arizona; residents nearby urged to shelter in place until further notice pic.twitter.com/DTlPFQvyx9

— Officer Lew (@officer_Lew) February 14, 2023

There’s been no official word about what the substance is, though many observers have commented that due to the color of the smoke it could be nitric acid.

Pima County Emergency Alerts were sent out to everyone’s phones. Anyone within a one mile radius is advised to shelter in place. pic.twitter.com/XygPjvNQvc

— JD Fitzgerald (@JD_Fotog) February 14, 2023

Prior to the accident, the National Weather Service issued visibility warnings for I-10 due to blowing dust.

🌬️ Blowing Dust Impacting Interstate-10 this Afternoon 🌬️

A channel of dense blowing dust has been observed west of #SanSimon in northeast #Cochise county.

Motorists traveling along I-10 should be prepared for rapidly reduced visibility below a mile due to blowing dust. #azwx pic.twitter.com/YFgDc7LvLS

— NWS Tucson (@NWSTucson) February 14, 2023

Given the situation in Ohio, where a train carrying hazardous materials derailed February 3 resulting in massive fires that released deadly toxins into the air and water, Tucson residents are demanding quick information and response – as they should.

(This is a breaking story. Updates will be reported as they become available.)