About one hour ago a massive fire began on Highway 271 and has blocked traffic in North Tyler.

According to KLTV 7, which is streaming the explosion/fire above, Tyler Welders Supply has gone up in flames - 3539 US 271. Smith County and Winona Fire Department are currently on scene as KLTV reports one firefighter is being treated for heat exhaustion.

It appears the business' employees have escaped to safety while buildings within a 1/2-mile radius are being evacuated for safety reasons.

KLTV has a reported on scene.