Irishman Ibrahim Halawa has been transferred to a different prison in Egypt, the Department of Foreign Affairs has confirmed through its embassy in Dublin and Egyptian authorities in Cairo after contradictory reports earlier today.
The 20-year-old was transferred from Tora Prison to the Wadi el-Natrun prison yesterday.
The Halawa family had said Ibrahim had been moved to another prison without them being informed and had asked the Government to find out more about his whereabouts.
Mr Halawa, from Firhouse in Dublin, was arrested in Cairo in August 2013.
He is due to stand trial with over 400 other defendants on charges that include alleged terrorism.
The trial has been adjourned several times with the next date set for June.
Earlier today, the Department of Foreign Affairs had been informed by Egyptian authorities that Mr Halawa remains in Tora Prison.
However, Mr Halawa's sister, Somaia, had said that the Egyptian authorities were lying to the department.
Speaking on RTÉ's News At One, she said: "They're lying every minute. And that's what we have been trying to explain.
"This judicial system needs a different type of negotiation, a different type of approach.
"A very harsh approach because it's almost three years now and this approach is no longer resulting in a good result."
Ms Halawa said she felt that her family was not getting enough support from the Government and that Irish officials needed to change their approach.
She added that one of the prisoners who had been held with her brother passed on the information that he had been moved to another prison but they did not know where he had been moved to.
Somaia said her uncle went to Tora Prison this morning and was told Mr Halawa "does not exist in Tora Prison".
She said it was easier for her older brother to go around prisons to find out where Mr Halawa was being held rather than go through Egyptian authorities.
In a statement this evening, the family said that Ahmed Halawa saw his younger brother in Wadi el-Natrun prison "after struggling from prison to prison trying to find him".
The family said it proves that the information the Egyptian authorities gave the Government was "not true".