Saoradh's Derry headquarters raided by PSNI as part of Operation Arbacia

The party's offices in Belfast, Newry and Dungannon have also been searched.

PSNI Crime Operations Assistant Chief Constable Barbara Gray said: "Detectives from Police service of Northern ireland's Investigation Unit have today searched properties in Belfast, Dungannon, Newry and Derry/Londonderry in connection with an ongoing investigation into the activities of the New IRA.

"The properties were searched under TACT legislation as part of Operation Arbacia, a community safety operation."

The search at Junior McDaid House follows what Saoradh branded the 'MI5-led' arrest of several party members earlier this week.

A spokesperson said: "Saoradh is not a proscribed organisation, we have as our means political agitation, mobilisation and grassroots activism. Since our formation in 2016 we have grown and we continue to grow."