A man in his 50s and two women in their 30s have been arrested over the petrol bomb murders of an English family in Waterford city. The arrests were made in the latest phase of the investigation. Two earlier suspects have already been charged in the case. The new arrests broaden the inquiry into who was involved in the attacks and how they were carried out. Authorities have not yet explained the precise role of each person arrested or whether they will face charges. The arrests do not replace the existing proceedings against the first two suspects. Police and prosecutors still have work to establish the full sequence of events and the evidence against those involved.