Eight people are being questioned in the North as part of an investigation into dissident republican activity.
Seven men - aged between 18 and 45 - and a 23-year-old woman were detained during raids by officers from the PSNI's Serious Crime Branch.
The raids took place this morning in north and west Belfast, Newtownabbey and Dunmurry.
Police also recovered a large quantity of ammunition and other items.
The eight people are being questioned at Antrim Police Station.