Two firefighters were killed in Zefyri, west Attica, after a section of an abandoned burning building collapsed while they were inside during firefighting operations. A third firefighter was injured in the incident on Saturday. Firefighters from a force of about 20 rushed to Katsantoni Street after the fire was reported at around 11:40 am. The floor gave way as they were operating inside the abandoned building, causing the two men to fall into the basement and be buried under debris. The two firefighters were taken to Attikon Hospital, where they were pronounced dead. The injured firefighter was transported to the 251 General Air Force Hospital. The report did not provide details on the extent of the injuries. Police in Attica have now arrested three people over the fire, Greek City Times reported. Investigators say the arrested woman, 34, and her two teenage daughters, aged 13 and 16, were allegedly dumping ash and other residue from a wood stove into the building's stairwell. The family lived in a ground-floor space of the abandoned property. Police allege they linked the dumped residue directly to the start of the Zefyri fire. Officers arrested the woman and the two girls under the in-flagrante procedure, while they continue searching for the girls' 44-year-old husband. Arson investigators also found rubbish, plastics and other material at the spot where the fire started. The Athens Arson Investigation Unit was also at the scene to determine the cause of the fire. The Fire Service has ordered a sworn administrative inquiry into the deaths, and its chief ordered flags at all fire stations to fly at half-mast. The investigation is ongoing under the arson unit, while the three arrested suspects remain in police custody. The minister of climate crisis and civil protection, Evangelos Tournas, said in a statement that he expressed condolences to the families and wished a speedy recovery to the injured colleague. Updated 14 November 2026: Greek City Times reported three arrests and alleged ash dumping as the suspected cause of the fire.