Two men have been stabbed at a house gathering in Sydney’s west.

Emergency services were called to a unit block on Patricia Street, in Mays Hill, in the early hours of Saturday to reports a man in his 20s had sustained serious injuries.

Paramedics treated the man for a stab wound to his torso before he was rushed to Westmead Hospital in a critical condition.

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Police arrived at the scene and found another man nearby with a wound to his arm.

The man, who is also aged in his 20s, was taken to Westmead Hospital.

The circumstances surrounding how the men were injured is under investigation.

A crime scene has been set up at a home on Patricia Street.

It is understood the two men who were injured and the other individuals at the gathering are all known to each other.