Elizabeth police are investigating links from a robbery yesterday at Paralowie to an overnight service station robbery at Bolivar. 

Just before 2.30am, a man wearing a bike helmet and a hooded top entered the Caltex service station on Port Wakefield Road Bolivar, he purchased two Chiko rolls but then threatened the console operator with a knife and demanded cigarettes. 

He left the scene on a bike with one packet of cigarettes.  There were no injuries. 

The suspect is described as a male Caucasion, about 35 years of age, wearing a grey hooded top and dark tracksuit pants. 

The same male is also believed to be responsible for a robbery at a Liquorland shop at Paralowie yesterday morning.