Police are investigating an aggravated robbery which occurred overnight at Pennington.

Just after 11.30pm 3 men, one allegedly armed with a screwdriver, entered a service station on Torrens Road and threatened the console operator. 

The suspects were last seen running out of the service station towards Addison Road with an amount of cash. 

They are described as being of aboriginal appearance, in their 20s with two wearing dark coloured track pants and another wearing jeans. 

All three were wearing dark coloured tops. 

The suspects are believed to have been involved in the robbery on the Subway at Findon earlier that morning and possibly driving a late model grey Holden Commodore sedan with NT plates 973966.