The PSNI has used a Taser on the attacker of a woman who was stabbed at a house in Lisburn, County Antrim.
Police responded to the incident in the Woodland Avenue area at around 2 o'clock this morning.
A man, carrying two knives, was observed in the kitchen struggling with a woman.
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Police said specialist firearms officers spoke with the man and a Taser was used.
The 21year old man was arrested.
A 19-year-old woman was taken to hospital for treatment for stab wounds to her chest.
Her injuries are not believed to be life-threatening.