SEATTLE -- The Seattle Police Department launched an investigation into an arrest earlier this year in which three officers are seen on camera using their fists, batons and a flashlight to subdue a man they said was resisting arrest.

Police said Daniel Saunders was mistakenly released from the King County Jail. Officers were going to arrest Saunders when they learned he was attempting to collect property in the evidence room on June 6.

Video shows Saunders opening the door for three officers who then moved in to arrest him.

DOCUMENT: Statement From Prosecutor's Office

Statements From Officers Involved

Video shows Saunders being forced to the ground. With three officers on top or next to the man, officers are seen punching Saunders and striking him with a baton and flashlight.

The officers said Saunders fought them and they had to use force to subdue him.

Police said Saunders was armed with a screwdriver.

King County prosecutors said the officers acted appropriately.

Saunders told KIRO 7 he plans to file charges against Seattle police.