Islamist rebels have captured the headquarters of the al-Qaeda-affiliated Islamic State in Iraq and the Levant (ISIS) in the Syrian city of Aleppo.
The Syrian Observatory for Human Rights said it was not clear what had happened to the jihadists who had been at the hospital in the Qadi Askar district.
Inside, the rebels found dozens of prisoners and the bodies of several men who appeared to have been executed.
Recent days have seen fierce fighting between ISIS and other rebel groups.
More than 270 people, including 46 civilians, have been killed in the worst rebel-on-rebel violence since the uprising in Syria began in March 2011, according to the Syrian Observatory, a UK-based activist group.