ERBIL - The European Union has expressed strong concerns over Iran's execution of a Kurdish "juvenile" inmate on Tuesday, noting that the suspect had suffered from mental illness.

Hengaw Organization for Human Rights revealed that Shayan Saidpour, who was born in 1997 and convicted of murder, was hanged on Tuesday morning in Saqiz central prison.

"Article 91 of Iran's Penal Code authorises judges to use their discretion and not issue a death sentence against a minor who was not able to comprehend the nature and consequences of the crime at the time it has been committed," reads a statement by the EU.

"The European Union regrets that this possibility was not utilised on this occasion, and also notes that Mr. Saeedpour reportedly had a history of mental illness."

It argued that the death penalties for underage prisoners "are inconsistent with Iran's international obligations under the International Covenant for Civil and Political Rights and the Convention on the Rights of the Child."

According to Hengaw agency, Saidpour committed the crime during a fight in 2015. Although he managed to escape from jail a few weeks ago, but arrested again by the security forces.