An argument between a boyfriend and a girlfriend escalated into the stabbing of the girlfriend’s brother and his friend, Phoenix police said.

The argument happened about 1 a.m. Friday at a home near North 18th Avenue and West Cheryl Drive, Officer James Holmes, Phoenix police spokesman, said in an email. The dispute moved outside and the girlfriend’s brother and his friend began hitting and kicking the boyfriend, Holmes said. The boyfriend pulled out a knife and cut both his attackers, Holmes said.

The injuries were not life-threatening, and both of those injured were in stable condition at a local hospital, Holmes said.

The incident was being investigated as domestic violence, as three of the four people involved live together, Holmes said.

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