An explosion has leveled a hotel in Syria's historic old city of Aleppo.
Activists and state media said rebel fighters were responsible for the blast Thursday at the 150-year-old Carlton Hotel.
The activists, including the Britain-based Syrian Observatory for Human Rights, said the explosion also killed government troops, but did not say how many.
The building site is located across the street from the Citadel of Aleppo, a 13th-century structure that the United Nations cultural agency describes as a "remarkable example" of military architecture in the region.
Aleppo's old city is a UNESCO World Heritage Site that has been caught in the middle of Syria's civil war. UNESCO placed Aleppo on its listed of endangered historic sites last year, saying many of the city's historical sites have been damaged by the fighting.