The men, who got away with cash, escaped down an alleyway at the side of the building society.
One person has been arrested in Dartford in connection with the raid.
The guard was taken to William Harvey Hospital, Ashford with minor injuries.
Police said it was believed the robbers drove off in at least one vehicle that was parked at Mountfield Industrial Estate.
Officers want anyone with information about the raid, or who saw any suspicious people or vehicles in the area, to come forward.
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BBC News |
