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The FBI is looking for suspects in the robbery of the Cathay Bank, 1095 El Camino Real in Millbrae, Calif., on June 3, 2013. (FBI)

SAN FRANCISCO -- A group of bank robbers dubbed the "High Jumper Bandits" have struck again, according to the FBI.

The Aug. 1 robbery of the First Republic, located at 6001 Geary Street in San Francisco, marks the fifth time the men have held bank employees and customers against their will and taken money before fleeing the scene.

The men have been dubbed the "High Jumper" Bandits due to their tendency to jump on tellers' counters during robberies.

The FBI, along with the San Mateo County Sheriff's Office and San Francisco Police Department, have again asked for the public's help in identifying the three suspects and have offered an unspecified reward to those who help in the capture and conviction of the men.

The suspects are described as three black males, approximately 20 to 35 years old with slim to medium builds. They were last seen wearing thick jackets, gloves, and clothing that would mask their heads and faces. One of the suspects is between 5 feet 8 inches tall and 5 feet 10 inches. The other two men are between 6 feet and 6 feet 2 inches tall.

Since April 19, the men have robbed three other banks in San Francisco and one in Millbrae, police say. The amount of money they have stolen has not been disclosed.

Witnesses have told police they saw one handgun displayed during the three of the robberies, including the Aug. 1 incident, and multiple handguns displayed during the group's first bank robbery in April.

Anyone with information about the identity or whereabouts of the suspects can either call 911 or call the FBI at 415-553-7400 in the San Francisco area. All calls are confidential. Tips can also be submitted at: tips.fbi.gov.

Contact Katie Nelson at knelson@bayareanewsgroup.com and follow her at Twitter.com/katienelson210.