The robbery took place at the Citibank branch located at 430 Arneill Road around 10:23 a.m.
The suspect, described as black male with a medium build standing around 5 feet 10 inches, was reportedly armed with a handgun.
He fled with an undisclosed amount of money and was last seen exiting through the south entrance of the bank. According to witnesses, the suspect ran through the parking lot and scaled a block wall.
No one was injured during the robbery.
Anyone with information about the suspect or the robbery was asked to contact Sergeant John J. Gleason at (805) 384-4727.
Ventura County Crime Stoppers will pay up to $1,000 reward for information that leads to the arrest and criminal complaint against the person(s) responsible for this crime. The caller may remain anonymous. The call is not recorded. Call Crime Stoppers at 800-222-TIPS (8477).