The explosions, including one allegedly at a food market, are said to be in retaliation for deadly drone attacks last week attributed to rebels

'We were taken by surprise,' opposition activist says of revelation that Abu al-Hassan al-Hashimi al-Qurayshi died during operation in October

Investigators for Human Rights Council attribute alleged rights abuses to Assad regime, Russian forces, al-Qaeda-linked fighters and Turkish-backed rebels

Abdel-Basset al-Sarout dies after he sustained wounds in battle; sport star had become a popular singer of protest songs against Assad regime before taking up arms