Two men, aged 52 and 51, and two women, aged 39 and 20, have been arrested in connection with the murder of a 61-year-old woman whose remains were found in the Wicklow Mountains last year.
All four will appear before Tallaght District Court later.
A 32-year-old man has already been charged with the murder after turning himself in last year.
Patricia O’Connor had been missing from her home in Rathfarnham, Dublin, for two weeks before her dismembered remains were found scattered along the Wicklow Mountains in June of last year.
Parts of her body were found by a tourist at Military Road in Enniskerry on June 10t 2017.