Four people have been arrested in connection with the murder of Lyrico Steede.
Lyrico, 17, was stabbed in the area of Stock Well, Bulwell, at around 7.30pm on Tuesday 13 February 2018. He died in hospital six days later.
Two 17-year-old boys and an 18-year-old man have been arrested on suspicion of murder.
A 17-year-old girl has been arrested on suspicion of conspiracy to commit murder.
Detective Chief Inspector Hayley Williams, who is leading the investigation, said: “We continue to pursue lines of enquiry in relation to the murder of Rico and if you saw anything that night or you have any information you think could assist our investigation, get in touch.”
Contact police on 101 quoting incident 734 of 13 February 2018 or alternatively call Crimestoppers anonymously on 0800 555 111.