More than 1,000 lines of inquiry have been pursued and 900 statements taken by Gardaí since an explosion at a service station in Creeslough, Co Donegal killed 10 people almost one year ago.
Four men, three women and three young people, ranging in ages from five to 59, died in the explosion on October 7th.
Robert Garwe and his five-year-old daughter Shauna Flanagan-Garwe, Catherine O’Donnell and her 13-year-old son James Monaghan, Jessica Gallagher, Martin McGill, James O’Flaherty, Martina Martin, Hugh Kelly and 14-year-old Leona Harper were all killed in the explosion.
Gardaí previously said the incident was being treated as a tragic accident, with a gas leak believed to be one theory.
As the first anniversary of the tragedy approaches, Gardaí said its investigation was continuing “as expeditiously as possible, in the circumstances” to ensure that the circumstances are “professionally investigated”.
Gardaí said they had actioned more than 1,350 lines of inquiry and taken in excess of 900 statements.
The investigation is being co-ordinated from Milford Garda station, with support from the Garda National Bureau of Criminal Investigation (GNBCI), Garda Síochána Analysis Service (GSAS) and the Garda Technical Bureau.
Gardaí are also being assisted by the Health and Safety Authority, the Commission for Regulation of Utilities and the Norwegian company Det Norske Veritas (DNV), which specialises in investigating and testing energy systems.