Gardai have tragically confirmed a fourth death resulting from a house fire this morning.

The four-year-old boy was the brother of one of the little girls who died earlier today in Clondalkin in west Dublin. The child passed away in hospital this evening.

Pregnant woman, three young children die in Dublin fire https://t.co/F9G1Shi4Am pic.twitter.com/x9RmgkFdyN

— RTÉ News (@rtenews) March 8, 2017

The Irish Examiner reported this evening that the 27-year-old woman who died in the blaze had been named locally as AnneMarie O'Brien - she is believed to have been seven months' pregnant. Her daughter, Paris, who was two, and three-year-old Holly O'Brien, were also killed.

Boy (4) dies from injuries following tragic fire that killed three overnight https://t.co/RkJy4RpRdS pic.twitter.com/n7kQPhnNfg

— Independent.ie (@Independent_ie) March 8, 2017

A 30-year-old woman, believed to be  Holly's mum, remains in critical condition in hospital this evening.

Sadly, we were called to a tragic fire in #Clondalkin in the early hours. Our thoughts are with the families, friends & local community.

— Dublin Fire Brigade (@DubFireBrigade) March 8, 2017

The apartment block in Clondalkin was used by the domestic violence charity, Sonas, as support accommodation for women fleeing domestic abuse.