Video: ISIS destroys priceless statues and sculptures

The Islamic State video showed men attacking the artefacts, some of them identified as antiquities from the 7th century BC, with sledgehammers or drills, saying they were symbols of idolatry.

"The Prophet ordered us to get rid of statues and relics, and his companions did the same when they conquered countries after him," an unidentified man said in the video.

The articles destroyed appeared to come from an antiquities museum in the northern city of Mosul, which was overrun by Islamic State last June, a former employee at the museum said.

The militants shoved statues off their plinths, shattering them on the floor, and one man applied an electric drill to a large winged bull.

The video showed a large room strewn with dismembered statues, and Islamic songs played in the background.

Watch: Islamic State militants destroying priceless statues and sculptures

Lamia al-Gailani, an Iraqi archaeologist and associate fellow at London-based Institute of Archaeology, said the militants had wreaked incalculable damage.

"It's not only Iraq's heritage: it's the whole world's. It's human heritage," she said.

"They are priceless, unique. It's unbelievable. I don't want to be Iraqi any more," she said, comparing the damage to the dynamiting of the Bamiyan Buddhas by the Afghan Taliban in 2001.

As well as Assyrian statues of winged bulls from Nineveh and Nimrud, Gailani said the Islamic State hardliners appeared to destroy statues from Hatra, a Hellenistic-Parthian city in northern Iraq dating back around 2,000 years.

Islamic State espouses a fiercely purist school of Sunni Islam, deeming many other Muslims to be heretics. They have destroyed Shi'ite and Sufi religious sites and attacked churches in the parts of Syria and Iraq under their control.

"Muslims, these relics you see behind me are idols that were worshiped other than God in the past centuries," the unidentified man in the Islamic State video said.

"What is known as Assyrians, Akkadians and others used to worship gods of rain, farming and war other than God and pay all sorts of tributes to them."