(Portland, OR)  --  Police say they've arrested a man accused of pointing a gun at a woman during an apparent road rage incident in Northeast Portland.  It happened Monday at Northeast 122nd Avenue and Sandy Boulevard.  Police say the suspect threw some type of liquid on the victim's car and used a rude hand gesture before pointing a gun at her.  Officers tracked him down and arrested him on charges of felon in possession of a firearm and unlawful use of a weapon.