Jawlani has moved to form a transitional government, get the buses running and turn the power back on.

The lightning overthrow of President Bashar al-Assad left Syrians, countries in the region and world powers nervous on Tuesday about what comes next as the rebel alliance took its first steps in a government transition.

There are several rebel groups fighting the al-Assad regime in Syria. The group that led the capture of Damascus was the Islamist militant group Hayat Tahrir al-Sham, which is designated a terrorist organization by the U.S. and other countries, according to the BBC.