During the afternoon, a joint offensive by Jabhat al-Nusra, Jaish Al-Fustat and Faylaq Al-Rahman targeted the Jaish al-Islam controlled village of Misraba (Damascus) which is located south of Douma.
A Jaish al-Islam spokesman said their fighters had repelled the attack after heavy skirmishes although he was unwilling to reveal the death toll due to rebel infighting.
Meanwhile, black smoke could be seen in the area by Syrian Arab Army (SAA) positions two kilometers west of the site.
Widely underreported, rebel factions have been clashing internally for the past two weeks in East Ghouta after the Jaish al-Islam leadership was accused of corruption.
For now, Jaish al-Islam is said to have control of the northern part of East Ghouta (most notably Douma) while rebel groups loyal to Jabhat al-Nusra control the southern part.
This split is unlikely to improve the strategic situation of Islamist rebel groups in Damascus as their forces are surrounded by the SAA as depicted on the map here.
However, locals of East Ghouta have now set up truce talks to stop internal clashes between armed groups of Syrian Opposition in Damascus.