Disturbing video filmed on Thursday April 9, 2015 by local news KNBC Channel 4 in Los Angeles captures a group of San Bernardino County sheriffs deputies beating a man after he had clearly surrendered. The man's name is Francis Pusok and he led police on a horseback pursuit. He clearly has his hands spread on the ground, and you can even see one of the cops kick him right in the groin, before proceeding on a full assault on the man.San Bernardino County Sheriff John McMahon has ordered an immediate internal investigation into what he called "disturbing" video showing an arrest by deputies after a horse pursuit that was caught on camera.Video Credit: www.nbclosangeles.com/news/local/Man-on-Stolen-Horse-Stunned