Two people are fighting for life in hospital after separate violent incidents over the weekend.

The first incident happened about 4.15pm on Saturday when two men allegedly attacked a 36-year-old man at a Hungry Jacks outlet on Wanneroo road.

The victim received life threatening stab wounds and remains in a critical condition in Royal Perth Hospital.

Police allege his attackers left the scene but were found at a house in Wanneroo.

The 21 and 22-year-old men are facing one count of grievous bodily harm each.

Meanwhile, a 24-year-old man is also in a critical condition at Royal Perth Hospital following an incident near an Albany nightclub just before 1.30am yesterday.

Police say the victim was hit on the head with a machete during a fight and was then struck by a car.

A man in his twenties is being questioned by police.

And a police officer continues to recover in hospital after being hit by a car.

He was involved in breaking up an out of control gathering early Sunday morning in South Fremantle.

It’s alleged police were trying to stop the car when it mounted a kerb and struck the officer.

The 19-year-old driver from Wellard is facing three charges, and the police officer is in a stable condition