A house fire in Waterford city claimed four lives and left two children critically injured, prompting a murder investigation. The blaze broke out on Birch Avenue in the Birchwood estate. Gardaí believe the fire was a deliberate attack. Two adults and two children died in the incident. Two other children remain hospitalized in critical condition. The fire started at a residence in the Birchwood estate, south of the city center. Authorities have launched a murder probe into the incident. No suspects have been identified yet. The cause of the fire is under investigation. The incident has raised concerns about safety in the area. Local residents are awaiting further details. The Gardaí are examining possible motives and suspects. The fire department responded quickly to the emergency. The house was partially destroyed by the flames. The victims were found inside the home. The investigation is ongoing.