Three men have been stabbed and one is seriously injured after a violent brawl at a park in the northern NSW town of Murwillumbah.
Police said they were called to Knox Park after reports of a fight, just before 12.30pm on Tuesday.
Witnesses said a group of up to 30 people were involved in the brawl. Several of them were reportedly armed with knives and glass bottles.
Paramedics treated a man in his 50s for stab wounds to the chest and a man in his teens for stab wounds to the chest and shoulder.
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A man has been arrested and three men have been taken to hospital. At least one is reportedly in a critical condition.
Several crime scenes have been established as police remain on the scene.
A NSW Police spokeswoman told news.com.au details were unclear but said Tweed police are looking into the matter.