Two hooded men armed with an iron tool entered a shop on Monday night and demanded money from the two cashiers.
The police said the incident happened in Triq l-Imsida, Santa Venera at 9.30pm.
The shop was being run by two women, a 16-year-old from Santa Venera and a 30-year-old from Ħamrun.
The men left the shop with a considerable amount of cash.
An inquiry is being held.
Police investigations are continuing.