Five Arizona police officers who were shown on camera pummelling an unarmed man last May will not face any charges, authorities have announced.
The beating of the 33-year-old man by Mesa Police Department officers was legally justified, investigators from another police force determined.
A lawyer for Robert Johnson says the attack was not legally permitted and threatened to sue in civil court.
Video shows Mr Johnson being hit repeatedly in the face and body.
The ruling was made by the Scottsdale Police Department, which was asked by the Mesa police - 20 miles (32km) east of Phoenix - to investigate the incident.
Detectives reviewed eight body cameras worn by the officers, as well as the CCTV, consisting of over two hours of footage.
Scottsdale investigators determined on Monday that "no criminal charges are warranted against the involved officers as the use of force was legally authorised and justified under Arizona State Law".
They added that the Maricopa County Attorney's Office agrees with the ruling.
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