A man robbed Bank of the West on Crown Valley Parkway Tuesday just before 4 p.m.
An Asian man in his 40s threatened that he had a gun, produced a note and demanded cash from a bank teller, said Orange County Sheriff's Department spokesman Jim Amormino.
The robber was last seen running toward a parking lot. No vehicle was spotted.
Helicoptors assisted deputies in searching for the man, but did not find him, Amormino said.
The FBI is searching for the man, whose image was clearly captured by security cameras. See images of the man attached to this story.