Rochester, MN (KROC AM News) - A Rochester man is accused assaulting, threatening and robbing a local teenager who wanted to buy some marijuana from the suspect.

The 19-year-old victim told police she met with the man in a parking lot in the Shoppes on Maine shopping center area early Sunday. The teen says when they met, the man pulled out a knife and threatened her and then punched her in the head a few times. She turned over $250 in cash and the man left. 

Arrested later in the day was 21-year-old Justin Peterson.