Seven people are still being held by police in Northern Ireland investigating the murder of north Belfast schoolboy Thomas Devlin.
Leading loyalist politician Billy Hutchinson, a former Stormont Assembly member and a leading member of the Progressive Unionist Party, is among those being questioned.
Mr Hutchinson, a former Ulster Volunteer Force prisoner, is a community worker in the Mount Vernon area of North Belfast where police believe the killer of the schoolboy lives.
Thomas (15) was stabbed close to his home in August 2005 as he walked home with friends after buying sweets at a filling station. Police believe his killers are from the Mount Vernon area.
He was knifed up to five times in the back. One of his friends was also injured.
The arrests have centred around Mount Vernon and the neighbouring Whitewell district. Police have seized items during searches of a property in the Ross Court complex on Monday.