Police are investigating links between at least two of three armed robberies on petrol stations in Perth’s northern suburbs overnight.

A BP petrol station in Padbury, at the intersection of Marmion and Warburton Avenue, was the first to be robbed around 10.28pm on Tuesday night.

A police spokeswoman said a man armed with a metal pole threatened the attendant, who was forced to hand over cash, cigarettes and mobile phones, while a second offender waited outside.

The second robbery, also in Padbury, was reported at the United petrol station at 10.32pm after the offender threatened the attendant with a screwdriver.

The incident took place on the corner of Hepburn Avenue and Walter Padbury Boulevard, less than 3km away from the first robbery.

Police are unsure what was stolen, but suspect the incident is linked to the first robbery.

The offenders are described as male and fair skinned, with one wearing a hooded jumper, and the other with a white T-shirt and dark jacket.

It is believed the men were driving a ute or 4WD vehicle.

The third robbery occurred around 2am when a man entered a petrol station in Butler, at the intersection of Lukin and Connolly Drive.

The man stole cash and was armed with what police believe was a handgun.

A police spokeswoman said the third robbery is not believed to be linked to the Padbury incidents.

The offender is described as male around 175cm tall, of slim build and wearing a black T-shirt and blue pants.

Anyone with information is asked to call Crime Stoppers on 1800 333 000 FREE.

Extracted in full from  Perth Now.