Three unarmed men wearing mask robbed a retail store at Vaiola Hospital in Tonga on Saturday 13.
The masked men entered the store and threatened two Chinese ladies and one Tongan employee.
Police said the robbers demanded cash from the trio about 10:15pm.
One of the men assaulted one of the shop keepers with a chair causing her head injury.
They then took $200 – $300 cash before they fled from the store.
The injured shop keeper was hospitalised but returned soon after and was in a stable condition.
Police investigation was underway.
