A 24-year-old man has been arrested in connection with an incident in Allenton where a teenager suffered a serious stab wound.
The 16-year-old victim was injured outside the Mitre pub at Spider Island at about 3pm on Sunday.
It happened in the area directly outside the pub, which stands on the junction of Osmaston Road, Osmaston Park Road and Harvey Road.
He was taken to hospital and remains in a serious condition.
A man was arrested in the early hours of this morning on suspicion of attempted murder and is still in custody.
Detectives are continuing their investigations and want to hear from anyone who might have information or who may have seen the incident take place.