The government has vowed to fight back. Russia, which deployed its air force to Syria in 2015 to help Assad, is conducting airstrikes in support of the army.

Islamist rebel group Hayat Tahrir al-Sham launched a lightning assault against pro-Assad forces in Aleppo. Here’s who else is fighting in Syria’s civil war.

Syrian rebels' capture of Aleppo from President Bashar al-Assad has brought the Syrian civil war back into focus, jolting frontlines that had been dormant for years with implications for the region and beyond.

Syrian opposition fighters have made a significant advance in Aleppo, capturing most of the city and controlling wide areas across Hama, Idlib, and Aleppo provinces. The offensive, aimed at halting attacks by government and Iran-backed forces,

The sudden assault by Syrian rebels has rapidly redrawn the civil war’s front lines and threatened once again the authority of President Bashar al-Assad.