Fire crews were battling a brush fire Thursday that erupted in north Simi Valley.

The Lost Fire was reported just after 6 p.m. near Young Wolf Drive and Swift Fox Court, according to Ventura County Fire.

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At least 20 acres were burned by the blaze, which officials believe can grow up to 50 acres.

The cause of the fire is still under investigation.

No evacuation orders have been issued.

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