Perth stabbing injures three, one critical

Three people are in hospital following a street fight in Perth's eastern suburbs that left at least two of them with suspected stab wounds.

St John Ambulance said a man and a woman were taken to Royal Perth Hospital following the incident in Kewdale on Friday morning.

The man was rushed there by St John Ambulance and is in a critical but stable condition, according to a hospital spokeswoman.

She said the woman, who has less serious injuries, was in a stable condition.

The other man was also brought to hospital.

A nearby worker told AAP she had seen authorities tending to the woman shortly after the fight.

"There is blood on the road," she said.