For the first time since the outbreak of the Syrian crisis, heated front lines are drawn between the Syrian army and the Islamic State (IS, formerly known as the Islamic State of Iraq and al-Sham, or ISIS). This development occurred following IS taking control over the neighborhoods of the city of Deir ez-Zor.

Jabhat al-Nusra and Ahrar al-Sham had withdrawn yesterday [July 14] from this city, in an expected move after the breakdown of their forces in rural areas of the city last...