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Firefighters were called to a large blaze at a historic apple ranch in the Yucaipa area Friday morning.

The fire was reported about 2:15 a.m. at Los Rios Rancho located in the 39600 block of Oak Glen Road in Oak Glen, according to a tweet from Cal Fire.

Multiple large buildings were involved in the fire.

Video provided to KTLA by Community Leo Watch showed a building fully engulfed in flames at one point.

It was unclear how many structures were damaged in the blaze.

The ranch is more than 100 years old and is a popular destination for visitors.

There was no immediate word on a possible cause of the fire.