(Portland, OR) -- Police say a man was stabbed and robbed inside a grocery store bathroom on Thursday in Portland. Officers found the victim, a 77-year-old man, with serious knife injuries and took him to the hospital, where he is expected to survive. Investigators say witness information and help from TriMet security led officers to arrest a 51-year-old man nearby later that day. The suspect is in jail facing first-degree assault and first-degree robbery charges.