Gardaí have released without charge a 56-year-old man arrested in connection the discovery of a bomb on the M50 motorway earlier this week.
A file is being sent to the Director of Public Prosecutions.
A 22-year-old man appeared before the Special Criminal Court yesterday, charged in relation to the discovery of the bomb.
Martin O'Rourke was charged with the unlawful possession of the improvised explosive device and with membership of an illegal organisation, styling itself the Irish Republican Army.
