UPDATE 9:01 PM
Chico, Calif.--The fire has been knocked down.
One of the southbound Highway 99 lanes will be back open in about 20 minutes.
Cal Fire officials said there are no reported injuries.
Chico, Calif.--Chico Fire is at the scene of a fully engulfed semi truck.
The California Highway Patrol says the semi lost a tire on southbound Highway 99 between the E. 1st Avenue and Cohasset Road exits.
The CHP is assisting and closed down both northbound and southbound 99 at the E. 1st Avenue and Highway 32 exit points.
It is advised to avoid the area at this moment.
We have a reporter on scene and will continue to bring the latest information as it becomes available.