ISIL uses a unit called the Kata'ib Taswiyya (settlement battalions), tasked with selecting targets for demolition. UNESCO Director-General Irina Bokova branded the ISIL activities in this respect as "a form of cultural cleansing" and launched the Unite4Heritage campaign to protect heritage sites threatened by extremists.
Although Libya, Syria and Iraq ratified the Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict in 1957, 1958 and 1967 respectively, it has not been effectively enforced. Read more on Wikipedia
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