Another service station has been robbed in Perth, this time in the northern suburbs.

At 2.50am this morning a man armed with a knife threatened a female attendant at a Puma service station on Ocean Reef Road in Pearsall.

He escaped with a large quantity of cash and is described as 175cm tall, caucasian, unshaven and wearing a black hooded jumper.

The incident follows a series of robberies at service stations across Perth during the past few weeks.

Extracted in full from the West Australian.