A boy (16) is in a stable condition in hospital today after being stabbed in west Belfast.
The youth was attacked at around 3.00am on the Stewartstown Road, near the Twinbrook estate.
Police arrested a youth (17) and are holding him for questioning.
The motive for the attack is unknown.
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In a separate incident, a 39-year-old man was stabbed in east Belfast. He suffered multiple stab wounds during the attack which happened in the Willowfield area at around 1am. His injuries were reported to be serious but not life-threatening. Police said a 16-year-old youth was being questioned about the incident.