The Greenhorn Bandits are described as three Hispanic or African-American males between the ages of 25 and 33, standing between 5 feet 8 inches to 6 feet tall. Surveillance photographs show the men wearing hooded sweatshirts and bandanas.
A fourth suspect was seen driving away from one of the robberies. Witnesses described a silver or light-colored Dodge Avenger in that incident. In another of the robberies, a silver or light-colored Chevy Colorado truck was seen leaving the scene with the suspects.
Witnesses told investigators the men appeared inexperienced and clumsy. That inexperience could make them more dangerous, according to the FBI. The suspects are considered armed and dangerous.
The Greenhorn Bandits are suspected of robbing two Cal Bank and Trust branches, one in Diamond Bar on May 16, and another in San Dimas on May 23.
In the most recent incident, a Community Bank branch on Citrus Ave. in Redlands was robbed on Thursday.
Anyone with information related to the robberies or the suspects is urged to contact the FBI or dial 911. In the greater Los Angeles area, the FBI can be reached 24 hours a day, seven days a week at 888 CANT HIDE (888 226-8443).