A couple have been attacked and left injured after a teenage girl allegedly stabbed them with scissors in a carpark in Perth’s north.

The couple, a 26-year-old man and 21-year-old woman were walking back to their car on Scarborough Beach Road about 9.20pm on Saturday when they were allegedly confronted by two teenage girls.

Both victims were taken to hospital. Credit:St John Ambulance

Police allege one of the juveniles was armed with a pair of scissors and threatened to stab the couple before lunging at the woman and stabbing her in the side, puncturing her lung.

The woman also received several smaller wounds on her arm.