Three teenagers have been arrested by police investigating the murder of Adam Regis, who was stabbed to death in Plaistow, east London, last year.
The 15-year-old was the nephew of former Olympic sprinter John Regis.
Police have now arrested a total of 17 people in connection with the murder inquiry and released 14 of them without charge.
The latest three were arrested on Friday on suspicion of murder and have since been bailed until February.
Two are aged 18 and one is 16 years old. Police said the arrests, in Newham, were new and not re-arrests of people previously questioned and freed.
The teenager was murdered as he made his way home after a night out in March 2007.
A £20,000 reward remains on offer for information leading to the conviction of those responsible.
Police still want to trace five people and a rare bronze Volkswagen Scirocco captured on CCTV circling the area.
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