Brush Fire Burns 30 Acres Near Castaic, Slows Traffic on Northbound 5 Freeway; Blaze Is 75% Contained

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Firefighters on Thursday afternoon were making progress against a wildfire that slowed traffic on the northbound 5 Freeway in the Castaic area, officials said.

Firefighters on the ground and in the air battle a fire burning in the Angeles National Forest not far from Castaic Lake on Aug. 6, 2015. (Credit: KTLA)

Firefighters on the ground and in the air battle a fire burning in the Angeles National Forest not far from Castaic Lake on Aug. 6, 2015. (Credit: KTLA)

The blaze, which began shortly after 12:03 p.m, spread to 30 acres before it was 75 percent contained, a spokesperson for the Los Angeles County Fire Department said. It initially burned through medium brush and moved in an uphill direction.

Personnel from county Fire Department were assisting Angeles National Forest firefighters at the location.

Traffic on the northbound side of the 5 Freeway was almost at a standstill as a result of the incident, Sky5 video showed.

A SigAlert was issued shortly before 1 p.m., and the No. 3 and No. 4 lanes were closed on the northbound side of the interstate, according to an incident report on a California Highway Patrol website. The lanes were expected to remain shut down for about an hour.

The cause of the fire was not immediately known.