UPDATE:
A Greyhound spokesperson confirms to 25 News one of its buses "experienced mechanical malfunctions" on I-35.
The spokesperson says the problem caused a fire, but no injuries were reported.
Those on board were placed on another vehicle within two hours and continued the trip.
Ensuring our passengers’ and employees’ safety and well-being is our top priority. We are taking this incident very seriously and are continuing to investigate it to help prevent similar events moving forward.
ORIGINAL:
Drivers are encouraged to avoid I-35 southbound in the Belton area on Wednesday.

25 News is working to confirm the cause of the back-up, seen on TxDOT cameras.
