CNN  —  A Syrian military operation against remnants of the former Assad regime has now ended, having sparked some of the worst violence seen in the country in years. Hundreds of people have been killed in the crackdown and fighting between the security forces and supporters of former President Bashar al-Assad since Thursday. What began as clashes between armed groups loyal to Assad and forces loyal to the new Syrian regime quickly spiraled into communal killings, with a war monitor saying at