“As our Iraqi Security Force partners closed in on the al-Nuri mosque, ISIS destroyed one of Mosul and Iraq’s great treasures,” Maj. Gen. Joseph Martin, the American commander for the operation, said in the statement. “This is a crime against the people of Mosul and all of Iraq, and is an example of why this brutal organization must be annihilated.”

The mosque is where the Islamic State leader, Abu Bakr al-Baghdadi, ascended a pulpit in 2014 and declared a caliphate after his fighters took control of Mosul and swept through other areas of northern Iraq and Syria.

The destruction of the mosque and minaret — which are pictured on Iraq’s 10,000 dinar bank note — is another blow to the city’s rich cultural heritage and its plethora of ancient sites that have been damaged or destroyed during three years of Islamic State rule.

Throughout the territory it controls, the Islamic State has routinely used mosques for battlefield purposes.