Police have arrested 38-year-old Stephen Daniel Dillard of Jurupa Valley for the attack.
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Dillard was booked for mayhem this past Tuesday and has since been released on $55,000 bail.
The attack happened just a few weeks ago around 5th Street and Fairmount Boulevard. Police started getting calls around 10:30 p.m. from people reporting a severed hand found on the sidewalk.
Detectives have discovered through their investigation that there are one or more witnesses to the medieval assault that have not yet come forward.
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The victim survived.
Investigators are urging anyone with information on the attack to contact the Riverside Police Department.