Brimbank Embona Taskforce detectives are appealing for public assistance following an armed robbery at a fast food outlet in Derrimut last week.

Investigators have been told two men, one armed with a hammer and the other with a knife, entered the store on Mount Derrimut Road around 4am on 13 April.

The offenders threatened staff and made demands for cash which was handed over.

The men left the store and were last seen walking west along Foleys Road.

Police believe the same offenders are responsible for three other armed robberies in the Brimbank area.

The offender is perceived to be of Pacific Islander in appearance, 180cm tall, with a medium build.

Detectives have released two images of the men they believe may be able to assist with their enquiries.