Gardai have arrested a man they believe may have information about last Monday's street murder of Real IRA terrorist Alan Ryan in Dublin.
The man, in his late 40s, was arrested on Thursday.
Gardai have been put on standby for the funeral of Ryan (32) this morning.
A series of checkpoints will monitor the movements of suspected dissident republicans as they arrive for the funeral.
A large contingent is expected from Londonderry, where Ryan had built up a lot of contacts.