Syrians mourned Syrian activist Mazen al-Hamada in Damascus whose body was found in Saydnaya prison after the fall of Assad regime. Mazen was a well-known activist during the Syrian revolution, and was arrested after his first release for speaking to international investigators about being tortured during his arrest. Thousands of prisoners spilled out of President Bashar al-Assad's merciless detention system after he was toppled on Sunday during a lightning advance by rebels that overturned five decades of his family's rule. Rights groups have reported mass executions in Syria's prisons, and the United States said in 2017 it had identified a new crematorium at Saydnaya for hanged prisoners. Torture was widely documented. The main commander of the rebels who toppled Assad said on Wednesday that anyone involved in the torture or killing of detainees during Assad's rule would be hunted down and pardons were out of the question.