BAGHDAD — Islamic State militants “bulldozed” the ancient Nimrud archaeological site near the northern Iraqi city of Mosul on Thursday, the government said.

Nimrud is a 13th-century B.C. Assyrian archaeological site just south of Mosul. The extremists have attacked other sites, claiming that they promote apostasy.

Iraq’s national museum in Baghdad opened last week for the first time in 12 years in a move Prime Minister Haider al-Abadi said was to defy efforts “to destroy the heritage of mankind and Iraq’s civilization.”