Extra police officers are patrolling the streets of Gisborne on Monday following a deadly weekend brawl at a 21st birthday party.

Two people died at the scene, and three others are in hospital with suspected stab wounds.

A double homicide investigation is underway Police say fighting broke out when two uninvited guests arrived, and a minor disagreement escalated.

A 29-year-old man is due in court this afternoon charged with wounding with intent.

Tairāwhiti MP Dana Kirkpatrick spoke to Charlotte Cook.