Eight deputies were filmed beating and kicking an alleged horse thief for two minutes as he lay dormant in the southern California desert. An NBC helicopter was following the San Bernardino County officers as they pursued a 30-year-old man, Francis Pusok, who was believed to have stolen horse on Thursday afternoon. The footage shows two deputies catch up with Pusok on foot after he falls off the horse, and they stun him with a Taser. He falls to the ground before standing up and trying to flee. They stun him again, and again, before launching over to kick him between the legs. Attack: Two deputies were captured on film kicking Francis Pusok, an alleged horse thief, in the groin . Escalated: By the end of the two minutes, there were eight deputies surrounding and beating Pusok's body . As he lies splayed face-down on the ground, they continue to beat him with their fists and stun guns. Thirty seconds in, another deputy runs to join, followed quickly by three more. Huddled in a pack over the man they each continue to pummel their fists into his back and head, some standing to kick. Meanwhile, another stands calmly holding the horse by the saddle. Chase: He had been seen riding the horse through the desert of San Bernardino on Thursday afternoon . Apprehended: An NBC film crew helicopter captured the moment he was stunned with a Taser . He tried to get up but they stunned him again before starting the beating . The San Bernardino County sheriff, John McMahon, has ordered an investigation into the incident, branding the video 'disturbing'. A Sheriff's Department statement says deputies tried to serve an identity-theft warrant on 30-year-old Francis Pusok of Apple Valley. Pusok allegedly sped off in a car that he abandoned, then stole a horse in Hesperia and galloped through rugged terrain. Deputies arriving by helicopter jolted him with a stun gun. He was taken to a hospital with unknown injuries. San Bernardino County sheriff, John McMahon, has ordered an inquiry, branding the video 'disturbing'
Film crew was following deputies chase horse thief in California desert .
Man falls off his horse, two deputies stun him with their Tasers .
They then kick him in groin and head repeatedly before others join them .
In total, eight deputies surround the man kicking him for two minutes .
San Bernardino County sheriff has called for investigation into the incident .