Former INLA leader Declan 'Whacker' Duffy has been arrested by gardai.
Duffy's arrest took place just before midday.
He is now being detained in Clontarf Garda Station.
It's understood he was arrested in connection to allegations of extortion.
Duffy's arrest comes just three days after the Herald revealed that Duffy and Dessie 'Border Fox' O'Hare were among a group of men involved in two incidents.