UPDATE (7:17 p.m.): CHP says a SIGALERT for northbound I-5 south at Lake Hughes Road will continue for at least another four hours.
The #1 and #2 lanes have been reopened following a semi tuck fire that spread to the nearby hillside. Caltrans says lane closures will be in place until 2 a.m.
A semi truck fire has closed several lanes of northbound Interstate 5 south of Pyramid Lake.
CHP reports a semi truck was on fire on the side of the road at around 3:30 p.m. about 10 miles north of Santa Clarita.
Southbound lanes are open, and the #1 lane of northbound I-5 is open.
Officials say the fire has spread to the hillside.
We will update this story as we learn more information.