The robbery happened at 3663 S. Miami Avenue about 7:10 a.m. Thursday.
The men entered the credit union wearing hospital scrubs and demanded money from a teller.
Three employees were kicked, sprayed with an aerosol irritant, and threatened with a firearm. They were treated at the hospital, but their conditions weren't immediately released.
The men left with an undisclosed amount of cash.
Anyone with information on the robbery is asked to call the FBI at 305-944-9101.
As the search continues for a cargo ship lost at sea after becoming caught in the path of Hurricane Joaquin, the U.S. Coast Guard says it found a life ring within a search area.
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