The use of the death penalty for crimes committed by people younger than 18 is prohibited under international human rights law, yet some countries still execute child offenders. Since 1990 Amnesty International has documented 138 executions of child offenders in 9 countries: China, the Democratic Republic of Congo, Iran, Nigeria, Pakistan, Saudi Arabia, Sudan, the USA and Yemen. There is more up to date version of this document here: https://www.amnesty.org/en/documents/act50/9511/2018/en/
