According to the source, al Nusra terrorists and their allies were preparing to use chemical weapons against the Syrian army in al Qaboun district of Damascus city.

The reports say the terrorist groups have deployed a large number of gas masks among their members and their families in Eastern Ghouta.
As noted, al Nusra terrorists had tried to attack the government forces, but the Syrian soldiers repelled this attack killing at least 10 al Nusra members.