UN Secretary-General Ban Ki-moon voiced outrage on Sunday over the destruction by the Islamic State group of Iraqi cultural sites, and urged the world to stop it.
"The secretary-general urgently calls on the international community to swiftly put a stop to such heinous terrorist activity and to counter the illicit traffic in cultural artifacts," Ban said in a statement from his spokesman.
"The deliberate destruction of our common cultural heritage constitutes a war crime."
He stressed that the perpetrators must be held to account.
Islamic State militants have bulldozed the ancient Assyrian city of Nimrud, smashed artifacts in the Mosul museum and have now reportedly set their sights on the 2,200-year old city of Hatra.
Ban said he was "outraged" by the destruction, citing the latest reports of the razing of Hatra, a world heritage site in the north of Iraq.
The UN chief spoke after Iraq's tourism and antiquities minister, Adel Fahad al-Shershab, called on the US-led coalition to protect archeological sites from the jihadists.
The coalition announced that it had carried out 12 air strikes in Iraq from Saturday to Sunday morning, including two near Mosul that reportedly destroyed an IS unit and two "excavators," but it was unclear if these were involved in attacking historic sites.
The UN Security Council last month adopted a resolution aimed at choking off financing for IS from antiquities trafficking as well as oil smuggling and ransom payments.
A ban on looted antiquities in Iraq was already in force, and was expanded to Syria under the resolution.
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