Four men robbed a house in Sandton, allegedly with the assistance of two domestic workers, Johannesburg police said on Friday.

Inspector Lee Ramdiyal said the incident happened on Thursday morning in Bryanston.

"The men gained access to the complex by pretending to be "service providers".

They then accosted the home owner, tied her up and ransacked the house of jewellery, cash, firearms and laptop.

The robbers fled in a white car.

After a police investigation it was suspected that the domestic workers could be involved in the robbery.

The domestic workers, aged 27 and 29, were traced and arrested.

"The domestic workers were in possession of some of the jewellery and cash that was taken during the robbery."

A man, aged 59, was also arrested for the robbery.

He was found in possession of a firearm and a large amount of cash.

Those arrested are being detained at the Sandton police station on charges of armed robbery.