Two women and two men are fighting for their lives after being stabbed in Melbourne’s west.

The group were stabbed at a home in Brain Street, Sunshine North in Melbourne’s west, with emergency services called just after 4pm on Thursday.

The two women, aged in their 30s and 60s, and the two men, aged in their 20s and 30s, were rushed to hospital with upper body injuries and are all in critical conditions.

Victoria police have arrested another man and say he is assisting them with inquiries.

A police spokeswoman said all parties were known to each other.