Four held over Limerick gangland murders
Limerick police have arrested two men and two women as part of an investigation into gangland crime including three murders.
They are being questioned about the deaths of rugby player Shane Geoghegan, 28, Roy Collins, 34, and 20-year-old James Cronin.
Those in custody are aged in their 20s.
On Wednesday five people were arrested as part of the same investigation, but have now been released.
The men and women arrested in Limerick city on Thursday are being held at Roxboro Road, Henry Street and Mayorstone Garda Stations.
Garryowen rugby player Mr Geoghegan was shot dead near his home in Dooradoyle in November 2008; Mr Collins was shot as he worked in the family amusement arcade in Roxboro and Mr Cronin's body was found buried in undergrowth in a field near the railway line in Limerick city centre.
Meanwhile, 11 people have been arrested following a series of raids in Dublin.
They were part of an investigation into organised criminality and drug trafficking in north inner part of the city.
Eighteen residential and two business premises, along with cars and prison cells in Mountjoy Prison were searched.
Eight men and three women, ranging in ages from 20s to 50s, have been arrested so far.