BRINKLEY, Ark. — According to the Brinkley Fire Department, an overturned truck caused a traffic backup Saturday morning on I-40, west of the Brinkley exit.

Officials say the truck that overturned was loaded with calcium nitrate, a compound that absorbs moisture from the air and is commonly found as a tetrahydrate. 

Hazmat responded to the incident and is working to clean up the spill.

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