Gardaí in Mountjoy, investigating the murder of Gareth Hutch, have made two further arrests.
The 35-year-old was shot dead on Tuesday morning in Dublin's north inner city.
Two people were arrested yesterday evening in connection with the shooting.
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They are being detained under section 50 of the Criminal Justice Act 2007 and are being held at Bridewell and Store Street Garda stations.
There is now a total of three people in custody in relation to this murder.