The Santa Rosa Police Department released a picture of the 3-foot-long sword.
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According to police, the 23-year-old man used the weapon to break into a car before hurting two people.
One person was stabbed in the face, another was hit in the leg with the sword, police said. Both are expected to be OK.
RELATED: Homeless man stabbed to death with 3-foot sword, suspect arrested
The incident happened on West 9th Street near Warren Lane on Monday night.
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"Arriving officers learned two neighbors were in an argument, while one of them was inside a parked vehicle. The suspect broke through a vehicle window with a blunt object, stabbing the victim in the face," said Santa Rosa police in a statement.
The second victim was hurt after trying to intervene.
Police say Brian Rivas-Lagunes was taken into custody on two counts of assault with a deadly weapon and vandalism.
"After detaining the suspect, officers located a 3-foot rusty sword at his adjacent property," said police.