Almost 800 babies were buried in a concrete, septic tank in the grounds of a home for unmarried mothers in Galway between 1925 and 1961, according to research by a historian.
The bodies of 798 children were buried at the Tuam mother and baby home, which was run by The Sisters of Bon Secours.
In 1975 the grave was found by two local boys, but the scale of bodies was not examined until recently, after historian Catherine Corless made repeated requests to the state for official records.
The site is believed to be one of 10 similar homes across Ireland - three others are believed to hold the remains of another 3,200 babies and infants.
The scandal has sparked renewed calls for the Irish Government to hold a public investigation.
More top news
Rap mogul Marion 'Suge' Knight has been arrested on murder charges after a fatal hit-and-run incident in Los Angeles.
The Canadian used only ice hooks to scale the frozen cliffs, and says the walls were "unstable" and "unpredictable".
Thousands of Virgin Media customers will lose their email address and emails after part of the broadband company was sold to TalkTalk.