BEIRUT — The minaret of a famed 12th century Sunni mosque in the northern Syrian city of Aleppo was destroyed today, leaving the once-soaring stone tower a pile of rubble and twisted metal scattered in the tiled courtyard.

President Bashar Assad’s regime and anti-government activists traded blame for the attack against the Umayyad mosque, which occurred in the heart Aleppo’s walled Old City, a UNESCO World Heritage site.

It was the second time in just over a week that a historic Sunni mosque in Syria has been seriously damaged. Mosques served as a launching pad for anti-government protests in the early days of the Syrian uprising, and many have been targeted.

Syrian’s state news agency SANA said rebels from the al-Qaida-linked Jabhat al-Nusra group blew it up, while Aleppo-based activist Mohammed al-Khatib said a Syrian army tank fired a shell that “totally destroyed” the minaret.

The mosque fell into rebel hands earlier this year after heavy fighting that damaged the historic compound. The area around it, however, remains contested. Syrian troops are about 200 meters (yards) away.

An amateur video posted online by the anti-government Aleppo Media Center activist group showed the mosque’s archways, charred from earlier fighting, and a pile of rubble where the minaret used to stand.