(CNN) -- Both sides in Syria's civil war were in rare agreement Wednesday: The minaret at a 12th-century mosque in Aleppo has been obliterated.

Unclear, however, was who destroyed the tower at the Great Umayyad Mosque, which has witnessed the march of nine centuries. It was just last month that a United Nations official expressed concern about the two-year war possibly damaging the mosque, a World Heritage site.

An opposition group blamed the government.

"Regime forces have committed today a new crime against human and cultural heritage by targeting the minaret of the mosque and completely destroying it," the Local Coordination Committees said. The group released a photograph of the mosque without its signature minaret, apparently reduced to rubble....