Police are continuing to question a man and a woman arrested in north Belfast in connection with the murder of 15-year-old Thomas Devlin.
Thomas Devlin was stabbed to death
Thomas was stabbed in the back as he and two friends walked home along the Somerton Road in Belfast, on 10 August 2005 after buying sweets.
On Tuesday, police made a fresh appeal for information about his murder.
They said more than 900 statements had been taken about the killing and more than 60 properties had been searched.
Thomas's 18-year-old friend was injured in the attack, but not seriously. A 16-year-old boy managed to escape.
Thomas, a student at Belfast Royal Academy, was a talented musician who played the horn at school.