Police are investigating an aggravated robbery at a service station at Daws Road Edwardstown.

At about 6.30pm, a man entered the service station armed with a firearm and threatened staff.

He left with an amount of cash.

No one was injured during the robbery.

The suspect is described as Caucasian, 165cm tall, wearing dark clothing and carrying a backpack.

He was riding a small black BMX bike and wearing a full face motorcycle helmet and sunglasses.

He was last seen heading north down Midera Avenue.

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