U.N. human rights experts are demanding that Iran halt the planned execution of a man who was arrested at age 17 and says he was tortured into confessing.

Saman Naseem was arrested in July 2011 after a firefight between Iran's Revolutionary Guard forces and members of a Kurdish rebel group. He was convicted for "enmity against God" and "corruption on earth" over his supposed involvement with the Kurdish armed group.

The U.N. special investigators on human rights in Iran and on extrajudicial executions said in a statement Wednesday that the execution of a juvenile offender is "clearly prohibited by international human rights law."

The rights group Amnesty International last week said the Iranian Kurdish man had been informed he would be hanged this week.

Iran has the world's second-highest number of executions, after China.