The carnage continues in Iraq.
ISIS has reported destroyed the Mashqi Gate near the city of Mosul, a 2,000 year-old structure that once guarded the ancient city of Nineveh, which was the largest city in the world in the 7th century BC, as the capital of the Assyrian empire.
The terrorist group has a history of defacing and demolishing ancient monuments, and did extensive damage in the Syrian city of Palmyra, host to a trove of art and architecture from antiquity.
Palmyra was taken back by Syrian government forces last month with assistance from Russia.
The Antiquities Department in Baghdad said that there were unconfirmed reports that ISIS was dismantling parts of the walls of Nineveh and were selling the mineral blocks.
ISIS is motivated by the belief that the artifacts predating the arrival of Islam are sacrilegious.
Last year, ISIS released a video of militants vandalizing a museum in Mosul, smashing priceless reliefs and statutes, including a carving of the iconic Assyrian winged bull, Lamassu.
The campaign of cultural destruction has reached beyond the Middle East into North Africa, where ISIS militants have destroyed Sufi shrines in Libya.