Gardaí are treating as suspicious a fire at a flat in Inchicore in Dublin, in which a woman and three children were injured.
An investigation into the cause of the overnight blaze is continuing.
The woman, a mother in her 30s, and her eight-year-old son are in a critical condition in hospital.
Her two other children, a 13-year-old boy and a seven-year-old girl, are also being treated in hospital.
The two boys were taken to Our Lady’s Children’s Hospital in Crumlin, and the girl was taken to Temple Street Children’s Hospital. The woman is being treated at St James's Hospital.
The fire broke out at around 11pm last night in the first floor flat in the Tyrone Place block.
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Local people in the area say the fire brigade was quickly on scene. Emergency services and the Fire Brigade fought the blaze for several hours.
One eyewitness said she heard screaming, looked out and saw the mother shouting for help. She said a man from another block ran with a ladder and got the mother and one of her sons out.
Local TD Bríd Smith, from Solidarity/People Before Profit, praised the work of the Dublin Fire Brigade and said the community's thoughts are with the family.
She also said it is important to await the investigation as to what caused the blaze.
The flat has been sealed off and gardaí have asked for anyone with information to contact Kilmainham Garda Station.
They have also been conducting house to house enquiries.