The fire was reported near Slauson Avenue at around 11:30 p.m. Monday.
The blaze was knocked down, but it prompted a closure of all southbound lanes of the 5 Freeway. Traffic was at a crawl through the area. Lanes began reopening around 6:30 a.m.
Several northbound lanes were closed but have since reopened.
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It was not clear when the lanes would be reopened.