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A woman in her 50s suffered a broken nose and will require surgery after a stranger stopped her on a San Francisco street and punched her repeatedly in face and head for no apparent reason, authorities said Wednesday as they released security video of the unprovoked assault. The attacker remained on the loose Wednesday and police officials are asking for the public’s help in catching him. “It kind of happened really quickly,” said Officer Giselle Talkoff, a spokeswoman for the San Francisco Police Department. “She was merely out for a walk and a stranger came up and just attacked.”