(NBC News) — Police in Arizona are promising an investigation after a video showing officers repeatedly punching a man came to light.
Mesa's police chief says officers were apparently investigating a May 23 domestic violence call when officers beat a friend of the suspect.
The man, 33-year-old Robert Johnson is shown looking at his phone near an elevator, then officers walk up and hit him several times in the face and body.
The elevator opens and more officers come out.
Mesa Police Chief Ramon Batista says he didn't know about the incident or the video until a week after it had happened.
Three officers and a sergeant have been placed on paid leave.
Read more: http://bit.ly/2LrbNDP