"These actions constitute the deliberate commission of the most heinous crimes of international concern. Indifference to this ongoing and extreme injustice will only further darken the future of humanity by jeopardising the shared values upon which our global community stands,” he wrote in a post on social media.

Pir Hossein Kolivand, the head of the Iranian Red Crescent Society, wrote a letter publicised late on Sunday to the president of the International Committee of the Red Cross (ICRC), demanding an explicit condemnation of attacks impacting children and educational and medical centres.