The report, citing Irish security sources, said all five people had sentences for funding terrorist offences abroad, rather than participating in terror plots here.

Ireland's former Minister for European Affairs Lucinda Creighton has said that social media platforms are actively resisting changes to legislation that would oblige them to prevent the sharing of terrorism content online.

A global counter-extremism organisation has praised the international police operation that led to the arrest in Dublin of an Algerian national on suspicion of supporting jihadist terrorism.