Triple digit temperatures and dry vegetation have created rapid spread of the Route fire near Castaic.
As of Thursday morning, the fire had burned more than 5,000 acres and was 12% contained.
The Route fire began around noon Wednesday and spread to about 60 acres by the time Los Angeles County firefighters were dispatched to the scene, according to the L.A. County Fire Department on Twitter. Flames burned about 250 acres by 5:27 p.m. near Lake Hughes Road on northbound Interstate 5, the Fire Department added.
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