A 23-year-old man is in hospital after being stabbed in the back at an address in Derby.
Police were called to the incident at a property on North Street in Strutts Park at about 0330 BST.
The victim is being treated at the Royal Derby Hospital. Officers said his injuries were serious but not life-threatening.
A 20-year-old local man was arrested in connection with the incident and was being questioned on Saturday.
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