Authorities say a man was conducting business at an ATM in the 1300 block of Warner Avenue on May 12 when a white SUV pulled into a parking space behind him.
The suspect got out of the BMW and approached the victim with a knife in his hand. He demanded all of the victim's money and also grabbed his wallet before he fled the scene, according to the Santa Ana Police Department.
The victim wasn't hurt during the incident. The suspect was wearing a baseball cap and a bandana over his face.
Anyone with information is urged to contact detectives at (714) 245- 8323.