Milwaukee Mayor Tom Barrett , seen in a file photo , was attacked Saturday night , police say . NEW : Police arrested Tom Barrett , Saturday , in connection with the attack . Police : Man beat Mayor Barrett with metal pipe at state fair on 20 . Anthony Peters heard a woman screaming and tried to help her , dialing 911 . Man who had been beating the woman then started hitting Barrett , police say .
NEW : Police arrested Tom Barrett , Saturday , in connection with the attack . Police : Man beat Mayor Barrett with metal pipe at state fair on 20 . Anthony Peters heard a woman screaming and tried to help her , dialing 911 . Man who had been beating the woman then started hitting Barrett , police say .