Police chief says he's 'deeply disappointed' in videos showing violent arrests

He said that he was launching two independent probes into the Mesa, Arizona department's use of force.
1:48 | 06/08/18

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Transcript for Police chief says he's 'deeply disappointed' in videos showing violent arrests
We want to turnext to Arizona police department under fire for an alleged pattern of abuse. A new case coming to light. The first incident this week showing police officers punching an unarmed man. Tonight body came footage shows the questionable treatment of a 15-year-old boy. Reporter: Facing growing outrage over a string of violent take downs the police chief offering two independent investigationings of the department's use of force. Let me be crystal clear. I'm angry and I'm deeply disappointed by what I saw in those videos. It's unacceptable. It needs to stop immediately. Reporter: The police department promising change. These investigations will shine a glaring light. Reporter: Overnight two more officers put on administrative leave after this video was released. You try and move one more time I'm going to You up. Reporter: The officers claim he has a again. He's unarmed. Where's the gun? No gun! Reporter: Police say the weapon was later found in a backpack nearby. Another five officers are on administrative leave after Robert Johnson's arrest. Police moving in after he refuses to sit down. Then taking him to the ground. We want these officers fired. These officers beat my client in the head. This is terrible. Reporter: As these investigations continue there are calls for greater accountability and Cecelia better training for the city's officers. Marcus, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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