First responders are reportedly attending to at least 27 people injured in a multi-vehicle crash on the southbound 15 Freeway in the Cajon Pass.

In a tweet shortly after 11:15 a.m., the San Bernardino County Fire Department said the three-alarm, major casualty incident occurred between Oak Hills and Highway 138.

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The conditions of the individual victims were unclear.

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The cause of the pileup was not immediately known.

I-15 is the preferred route for folks traveling to and from Las Vegas, Nevada.