Two men have been arrested in connection with the murder of a Catholic community worker in Coleraine, Co Derry last May.
The men - aged 45 and 46 - were detained in Coleraine for questioning over the killing of father-of-four Kevin McDaid and the attempted murder of another man.
Mr McDaid (49) was beaten to death close to his home in Somerset Drive by a loyalist mob that stormed the area after Rangers beat Celtic to the Scottish Premiership title.
Damien Fleming (46) was critically injured in the same attack as Mr McDaid.
Police have already charged 11 people in connection with the killing - seven of them with murder.
There have been constant claims of threats against witnesses, and last month the High Court in Belfast was told that more than 20 people are under death threats.
Mr Fleming has since been attacked a second time.