Police are looking for two men who terrorised staff and customers at a Subway store in Maddington overnight.
At about 8.20pm, two men entered the Albany Highway store.
According to police, one of the men pointed a firearm at customers who were sitting at a table and employees behind the counter.
The other man used a knife to threaten a female staff member.
The first offender stayed with the customers and forced them to kneel on the ground.
The other walked behind the counter and threatened the female employee with a knife, demanding she open the till.
He was given an amount of cash before both offenders left the store.
Anyone who can assist in this investigation is asked to call Crime Stoppers on 1800 333 000.