A Riverside man told Buffalo police he was walking on Marion Street, not far from his Grote Street home, Saturday afternoon when a stranger with a thin beard bumped into him.

The two exchanged words, then the stranger stabbed the Riverside man in the left bicep with a knife, police said.

The victim was taken to Erie County Medical Center for treatment.

The incident occurred sometime between about 4:30 p.m. Saturday, the victim told police.