A prominent Syrian opposition group has accused the government of violating the ceasefire and warned that a break in the fighting cannot occur while "militias and states kill our people," Reuters reports.

Jaish al-Islam is one of the strongest groups fighting against President Bashar al-Assad and is part of the Saudi-backed High Negotiations Committee.

"Our confrontations with the Assad gangs did not stop, whether in the Ghouta, in Homs, or in Aleppo, and as far as we are concerned, the war effectively did not stop on the ground in the shadow of these violations," read an official statement.

"The regime has been launching a fierce attack on the area for more than four months and we were surprised that after the declaration of the truce by the international community that this attack continued and the Assad forces took new positions in the area."