 Despite signing the Convention on the Rights of the Child, Iran, according to human rights groups, is the world's largest executioner of juvenile offenders.As of May 2009, there were at least 137 known juvenile offenders awaiting execution in Iran, but the total number could be much higher as many death penalty cases in Iran are believed to go unreported.Of the 43 child offenders recorded as having been executed since 1990, 11 were still under the age of 18 at the time of their execution while the others were either kept on death row until they had reached 18 or were convicted and sentenced after reaching that age.