The Department of Foreign Affairs has confirmed that three sisters from Dublin who have been detained by Egyptian authorities have been released.
The three members of the Halawa family were arrested during a protest march in Cairo in August.
They have been in a Cairo prison for nearly three months.
Their brother, 17-year-old Ibrahim, remains in custody and is due to attend a court hearing tomorrow.
The siblings had been detained without specific charges.
They became trapped in the al-Fateh mosque after taking part in a protest related to the ousting of former Egyptian president Mohammed Mursi.
In a statement, Tánaiste and Minister for Foreign Affairs Eamon Gilmore welcomed the development.
Mr Gilmore added: "I telephoned Egyptian Foreign Minister Nabil Fahmy on Monday last to express my concern that the Halawa siblings had been kept in prison for almost three months without being charged with an offence."