A two-acre vegetation fire temporarily shut down southbound Interstate 15 near Rainbow in the North County of San Diego Monday before it was 90 percent contained.
Cal Fire, Pala and North County Protection District fire crews rushed to the scene of the blaze around 1 p.m. near Rainbow Valley Road.
They found a fire burning in medium fuel at a moderate rate of speed with the potential to threaten nearby structures.
California Highway Patrol officers issued a Sig Alert for the area and closed the interstate temporarily. Two of the four lanes have reopened to traffic.
The San Diego County Sheriff's Department prepared to evacuate a nearby mobile home park but no evacuations took place.
No one was injured.
Firefighters expect to be on the scene for the next two to three hours, mopping up.
There was no word on what caused the fire.
No other information was available.
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