Detectives investigating the murder of a GAA official in Co Derry eight years ago have carried out a series of raids in Northern Ireland.
Police hunting the killers of 61-year-old Sean Brown searched more than 30 properties in counties Antrim, Armagh and Tyrone.
Nine people, eight men and a woman, were arrested during the operation and are being questioned under terrorist legislation.
Four other people were also arrested by police investigating other crimes linked to loyalist paramilitaries.
A Loyalist Volunteer Force gang abducted Mr Brown as he locked up Gaelic football club grounds in Bellaghy in May 1997.
The paramilitaries shot him dead and his body was later found with his burnt-out car near Randalstown in Co Antrim.
Following the killing, the then RUC launched a murder inquiry but that was strongly criticised in a report by the Police Ombudsman, Nuala O'Loan.
The murder case was reopened by the PSNI Chief Constable Sir Hugh Orde after appeals from the victim's family.
