GENEVA (AP) — The U.N. human rights office has criticized Iran over the reported execution of a juvenile offender.

A spokeswoman for the U.N. High Commissioner for Human Rights says the Geneva-based agency is "deeply dismayed" about the execution of Ali Naderi last week.

U.N. spokeswoman Cecile Pouilly said Tuesday that the "death penalty cannot be imposed for crimes committed by persons below 18 years of age."

Naderi was 17 when he was allegedly involved in the murder of a woman about four years ago.

Pouilly said the U.N. rights office was also concerned about five other men who appear to be at risk of imminent execution despite "serious concerns about the fairness of their trials and allegations that they were subjected to torture."

She says Iran carried out at least 55 executions in 2012.