Two men arrested earlier this week in connection with the murder of Baiba Saulite last year have been released without charge today.
Two men and two women were arrested in Dublin on Wednesday and taken to separate Garda stations for questioning under Section 30 of the Offences Against the State Act.
The women, both aged 20, were freed without charge yesterday.
Files are being prepared for the Director of Public Prosecutions in respect of all four.
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Ms Saulite (28), who was originally from Latvia, was shot dead at the doorway of her home in Holywell Square, Swords, Co Dublin, on November 19th, 2006, as her two children slept upstairs.