Nine men who were being questioned about the murder of Anthony Russell in Dublin last Friday have been released without charge.
One man remains in custody tonight in relation to the shooting dead of the 20-year-old in a pub in Artane.
Three others were released this morning.
A total of 13 men were arrested in raids across north Dublin yesterday morning.
Over 120 gardaí were involved in the raids on more than a dozen houses.
Gardaí say the operation is focused on the groups and individuals involved in an ongoing north city feud.
