The trial in Egypt of Dubliner Ibrahim Halawa has been adjourned for the 13th time.

Mr Halawa was due to undergo a mass trial in Cairo today, but the hearing was adjourned until June 26.

Amnesty International has condemned the latest delay, and called for his immediate release.

The 20-year-old has been in prison without trial since August 2013.

Amnesty says it is gravely concerned for his mental and physical well being.

The organisation says there are reports that Ibrahim has been tortured and mistreated in prison.

Colm O’Gorman, Executive Director of Amnesty International Ireland, said: "As Ibrahim spends his 942nd night unjustly incarcerated, Amnesty International continues to be gravely concerned for his mental and physical wellbeing.

"During this time, this young Irish citizen has been living in truly horrific conditions in an Egyptian prison cell. Ibrahim is a Prisoner of Conscience detained solely for peacefully exercising his right to freedom of expression and freedom of assembly. His continuing imprisonment represents an inexcusable violation of both international and Egyptian law.

"We reiterate our call for his immediate and unconditional release. We urge the next Irish Government to continue working on his behalf and to use every means at their disposal to secure his release."