Gardai have arrested another suspect for questioning about a gun murder in west Dublin almost a year and a half ago.
Officers detained the man in his mid-40s and brought him to Ronanstown garda station in connection with their inquiries into the shooting of Dean Johnston, near his home at Moorefield Avenue in Neilstown in May 2011.
The man is being held under section 30 of the Offences Against the State Act and can be detained without charge for up to three days.
On Tuesday, detectives arrested a 23-year-old man under section 50 of the 2007 Criminal Justice Act.
Gardai believe Mr Johnston's murder is linked to a local feud in the Neilstown area. He was hit in the head and shoulder when the gunman fired five shots from a 9mm handgun.