PORTLAND, Ore. (KOIN) — A burning truck blocked southbound traffic on Interstate 5 on Thursday.

Tualatin Valley Fire and Rescue worked to extinguish the truck fire near exit 290 around 11:40 a.m.

Crews are still working to clear the scene, but the fire appears to be extinguished.

Two I-5 southbound lanes are currently open, according to officials. Exit 290 is closed. Commuters should expect long delays or use alternate routes.

The cause of the fire is still under investigation.

This is a developing story.