Crews battle structure fire at Los Rios Rancho in Oak Glen

OAK GLEN, Calif. (KABC) -- Firefighters were working to extinguish a blaze at Los Rios Rancho in Oak Glen on Friday morning.

The four-alarm fire broke out just after 2 a.m., according to Cal Fire.
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Multiple structures were involved, fire officials said.

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The extent of damages is not yet clear.
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The cause of the fire is under investigation.

DEVELOPING: This report will be updated.