A fourth person was arrested last night in connection with the murder of a 16-year-old college student who was attacked as he celebrated the New Year.
Bradley Whitfield is thought to have been stabbed with a broken bottle shortly after leaving a party near his home in Leicester in the early hours of yesterday.
Leicestershire Police detained a 14-year-old boy, a 15-year-old girl and a 31-year-old woman shortly after the death, and later took a 34-year-old man into custody, a spokesman confirmed.
Earlier, local people spoke of their shock at the violent death, although none appeared to have any idea of the motive for the killing.
It is known Bradley was pronounced dead at the scene after officers were called to a report of an assault on Fosse Road South, Leicester, at about 5.15am.
A 300-yard police cordon was still in place around the murder scene last night as forensic officers continued with their investigation.
Meanwhile, Bradley's friends left flowers and notes paying tribute to the keen footballer, rugby player and swimmer.
One of the notes - signed by Liam and family - read: "Brad. We had some great times mate - can't believe you have gone. We will miss you."
Another note read: "To Bradders. When I woke up I heard the news and my heart sank. You were a top lad and I will always miss you."
Local people said they were shocked that Bradley, who is thought to have been killed after leaving a New Year party, had been targeted.
Shane Faulkner, a close friend of Bradley's family, said: "He would never have caused anything or provoked anything. I have never ever known him to be in trouble."