DENTON COUNTY, Texas — Road crews have reopened northbound lanes on I-35W between Dale Earnhardt and Farm to Market 1171. 

All lanes were previously shutdown Thursday after an 18-wheeler caught on fire, officials reported. 

The cause of the accident is under investigation. 

This is a developing story. Check back for new information. Download our free WFAA app to stay up-to-date on all news stories in the Dallas-Fort Worth area.