Thirty per cent of the Old City of Aleppo has been destroyed and 60 per cent significantly damaged amid the ongoing conflict there, UNESCO said Friday.
The assessment, made by an emergency mission from the agency that visited Aleppo from Jan 16-19, reported "extensive damage" at Great Umayyad Mosque, other mosques, churches, museums and other sites in the Syrian city.
Aleppo has been besieged by heavy fighting between rebels and the regime. The eastern party of the city fell to Russian-backed government forces in December.
UNESCO said that many schools in the city were also destroyed, saying that, "the very few schools still in operation are in dire situation, unsafe for learning, deprived of electricity or water, featuring broken doors and windows, as well as fragments of shrapnel."
The assessment was released on the same day that UNESCO confirmed the destruction of a monument and partial destruction of a theatre in the ancient city of Palmyra, held by the militant group Islamic State.
The general director of the UN agency, Irina Bokova, called in a statement for all parties in the conflict to refrain from targeting cultural and educational institutions.