(Portland, OR) -- Police say they've arrested a man after he pulled out a fake gun during an argument on a MAX train. Police arrested 19-year-old Shawn Brunner earlier this week on charges of second-degree disorderly conduct and interference with public transportation. Police say he was arguing with someone on the MAX Orange Line near Tilikum Crossing when he pulled out a replica firearm. The fake gun was designed to fire blanks. No injuries were reported.