A Tractor trailer catches fire on I-81

A truck carrying a chemical called Sodium Hydrosulfite is burning on I-81 tonight. The fire is causing a backup for miles as both Northbound lanes are shut down. The Roanoke City Haz Mat crew is on scene with Roanoke County units. The firefighters are having a problem putting the fire out because Sodium Hydrosulfite reacts to water.

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