Police say 38-year-old Nathan Campbell has been booked for investigation of murder and remains jailed Sunday on $1 million bail.
He turned himself about two hours after the attack that occurred at around 6 p.m. Saturday. Investigators don't yet have a motive.
Witnesses reported a horrendous scene of people scattered and bloody in the popular tourist area.
A coroner's investigator tells City News Service that the dead woman is 32-year-old Alice Gruppioni of Italy.
Police say another victim was critically hurt, two were in serious condition and others were treated for less serious injuries.
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