Two men arrested in an operation targeting dissident republican activity in Northern Ireland and Europe have been released without charge.
Detectives have been granted more time to question another six people arrested on Monday.
Two others were released without charge on Tuesday.
Meanwhile, a man arrested in a separate incident in Belfast is being questioned over dissident republican activity in the north west of Northern Ireland.
On Monday, premises in counties Armagh and Fermanagh were searched.
Police said a handgun, explosive material and other bomb making items were found in searches on Lettergreen Road, Donagh.
A related search in France continued into Tuesday.
Police said the searches were part of a joint investigation "between the PSNI Crime Operations Department and the British Security Service" and had "disrupted a potential major terrorist conspiracy".