A man walked into a U.S. Bank in the city of Lake Forest, California and robbed a teller at gun point. Authorities say the man is approximately six feet tall and about 170 lbs, wearing a bicycle helmet.

Sheriff spokesperson Mike Jansen says the man walked into the bank,showed the teller a note and a weapon, collect money and leaves without being followed. Orange County Sheriff's Department and the F.B.I are investigating.