Swindon Police say they are continuing to question a 14-year-old boy on suspicion of murder after a fatal stabbing in north Swindon on Sunday, 4 December.
Officers responded to reports of a stabbing on Mazurek Way, Haydon End at around 1.30pm.
An 18-year-old man, who has yet to be officially named but has been named on social media, died following the incident.
While the 14-year-old remains in custody, a 20-year-old man who was also arrested on suspicion of murder has been released under investigation.
Det Chf Insp Phil Walker, of the Murder Crime Investigation Team, said: “This is a fast-paced investigation and we are exploring many lines of enquiries.
"We recognise this will have had a huge impact on the local community and we are heartened by the large number of people who are coming forward with information to help with our enquiries.
"Please do get in touch, even the most seemingly insignificant piece of information can sometimes be a vital element in our investigation.”
People who feel they can help are asked to contact the police on 101, quoting Operation Glendale, or anonymously via CrimeStoppers on 0800 555 111.