Gardaí investigating a double shooting in Dublin yesterday suspect it could be linked to a dispute between dissident republicans and a Dublin criminal. 

The scene in Bluebell where a man and a woman were shot and seriously injured yesterday remained sealed off today as gardaí conducted house-to-house inquiries and try to establish what happened. 

It appears that a person close to dissident republicans was involved in a dispute with a Dublin criminal and that three men arrived here from Northern Ireland to threaten him. 

However, several shots were subsequently fired at the men and into a flat at Bernard Curtis House. 

A 30-year-old woman was hit in the chest and arm. A child was also in flat at the time of the shooting.

A man later presented himself to hospital with gunshot wounds. 

Both the man and the woman remain in a serious condition in St James's hospital.  

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Four men in their 20s and 30s were arrested, three are from the North, one from Dublin.

Two were detained at Kevin Street Garda Station, two at Irishtown and Kilmainham, all under Section 30 of the Offences Against the State Act - anti-terrorist legislation. 

Three of the men were released without charge this afternoon. 

The Special Detective Unit which investigates subversive crime is also involved in this investigation.

Gardaí are trying to establish a motive for the shooting.

The man in hospital appears to have accidentally shot himself; the seriously ill woman is related to a dissident currently serving life in prison for the murder of the Dublin drug dealer Eamon Kelly nine years ago. 

Gardaí are waiting to interview both victims to try to establish what happened and why, and further arrests are expected.