(Beaverton, OR) -- A man is facing assault charges after allegedly punching a grocery store cashier in the face. Police arrested 44-year-old Hathasone Pathammavong yesterday afternoon at the Fred Meyer store on Walker Road in Beaverton. Witnesses say the cashier was helping other customers when Pathammavong punched her. Police say witnesses held the suspect until officers arrived to arrest him. There's no word yet on what prompted the assault.