Correction: Earlier reports initially said the accident was on the 210 east. The accident was on the 210 West. Patch regrets this error.
UPDATE, 1:50 p.m.: The CHP reports the accident is still not cleared.
Original: A big rig fire has slowed Thursday traffic on the west 210 Freeway just before the Sierra Madre exit. The incident occurred around noon.
Pasadena Fire Department spokeswoman Lisa Derderian said the big rig is fully engulfed in flames and additional units from Arcadia are also on scene.
The cause of the accident is unknown at this time.
Patch will update this story as more information becomes available.