The men forced their way into the bank early in the morning and threatened its 16 employees until they handed over “a significant amount” of money.
Although some were tied up, none of the bank employees were hurt and the men fled immediately on foot with their swag.
Witnesses said that the robbers were wearing black clothes, wigs, and sunglasses.
At least one of them was armed with a gun, a police spokesman said.
Police said they were searching intensively for the criminals and asked anyone with information to call them on 0241 9577 0.