Detectives investigating the murder of schoolboy Thomas Devlin have seized a number of items during searches of homes in north Belfast.
Thomas Devlin was murdered in a knife attack
The police said the premises in the Mount Vernon area had been searched on Thursday in connection with his death.
Thomas, 15, was stabbed five times as he and two friends walked along Somerton Road on 10 August.
In September, the PSNI confirmed the prime suspects in the inquiry were two young men with a black and white dog.
Thomas, a student at Belfast Royal Academy, was a talented musician who played the horn at school.
He had just bought sweets from a nearby shop and was on his way home when he was stabbed in the back five times.
His 18-year-old friend was injured in the attack, but not seriously. A 16-year-old boy managed to escape.
A number of people detained for questioning about the murder were subsequently released without charge.
Thomas' mother Penny Holloway has said whoever attacked her son meant to kill him.