Semi crash and hazmat spill blocking I-10 WB at Pederson in Waller Co.

Road crews are working to clear a large crash involving a semi on I-10 westbound at Pederson in Waller County.

All mainlanes are blocked. The incident is listed as a hazardous materials spill on the Houston Transtar website.

There’s no word what led up to the crash or whether there were any injuries.

Expect delays.