A picture taken on July 12, 2015, shows a damaged wall of Aleppo Citadel following a reported explosion the previous night in a tunnel near the monumental 13th fortress. The official SANA news agency said 'terrorists' blew up the tunnel, causing the damage to the historic citadel, as the Syrian Observatory for Human Rights said it was unclear who was behind the attack. AFP PHOTO / AMC / ZEIN AL-RIFAI        (Photo credit should read ZEIN AL-RIFAI/AFP/Getty Images)