Officers were called to a home on 21st Street around 2:15 am.
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When they arrived, the victim told investigators that he was attacked and hit in the head with the hammer.
Police say 51-year-old Brian Arredondo swung the tool at the victim's head three times.
Paramedics helped the victim, who suffered minor injuries.
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Investigators also recovered the hammer. Detectives are working to determine what led up to the attack.
Arredondo was taken into custody by officers. He is facing charges of attempted murder.