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Sheriff Orders Immediate Internal Investigation Into Arrest Seen on "Disturbing" Video

The girlfriend of a man beaten by deputies caught on NewsChopper4's camera was shocked.

The San Bernardino County Sheriff ordered an internal investigation Thursday into an arrest caught on NBC Los Angeles' NewsChopper4 video that showed deputies beating a suspect when they caught up to him following a wild desert chase on horseback.

Aerial footage showed the man falling off the horse he was suspected of stealing during the pursuit in San Bernardino County Thursday afternoon.

Mom of Man Beaten After Horse Chase Slams Deputies

He then appeared to be stunned with a Taser by a sheriff's deputy and fall to the ground with his arms outstretched. Two deputies immediately descended on him and appeared to punch him in the head and knee him in the groin, according to the footage, reviewed several times by NBC4.

The group surrounding the man grew to 11 sheriff's deputies.