Portland Police said in a news release Joseph Johnson, 40, pulled a gun on neighbor Jordan Merrell in the parking lot behind the building they live in Tuesday and demanded Merrell hand over some unspecified property.
Johnson allegedly shot Merrell in the leg before fleeing. Police said he shoved his gun into the waistband of his pants and accidentally shot himself in the testicles while running.
A Transit Police officer spotted Johnson getting into a car later that night and he was arrested after falling to the ground while attempting to flee.
Johnson, who was found to be carrying a handgun reported stolen in November, was treated for his injuries before being released for booking into the Multnomah County Jail on charges of first degree robbery, second degree assault and felon in possession of a firearm.
Merrell was hospitalized with serious injures police said were not considered life threatening.