The Syrian Observatory for Human Rights (SOHR) announced on Tuesday that at least 25 people, half of them children, were killed in three cities in eastern Ghouta, countryside of the southern capital city of Damascus.
The aerial bombardment by regime warplanes attacked three cities in the rebel-held neighbourhood of Eastern Ghouta; Douma, Erbin and Hammoriyya. In Douma, 11 civilians were killed, including five children.
While at least nine people including six children and a woman were killed in raids on the city of Erbin, three others were killed in the outskirts of Hammoriyya.
In the Western Ghouta, the regime helicopters dropped 10 barrel bombs on the city of Darayya, no information about victims has been reached, the SOHR said.
At least 100 people were killed and 250 others were wounded on 16 June after an air strike carried out by the regime air forces on a busy marketplace in the neighbourhood of Douma.
Meanwhile, the prominent opposition faction in the southern Syria, Islam Army, said in a statement issued on Tuesday that the Syrian regime is targeting the city of Damascus in order to deform the appearance of opposition in front of the civilians in the city. The statement affirmed that the shellings and the rocket which targeted the city of Damascus were launched from areas under regime control in the Qasioun mountain, and the Sabboura neighborhood located in eastern Damascus.
At least 10 civilians were injured in the shellings which targeted the vicinity of the city a day after 11 people were killed in 50 shellings on separate neighbourhoods of the capital.
The civil war in Syria started in 2011 following a brutal crackdown on anti-government demonstrations and later developed into a multi sided conflict between five main factions - the Syrian regime, opposition groups, the Al Qaeda-affiliated Nusra Front, ISIS, and the Kurdish YPG militia.
According to the UN estimates, more than 220,000 people have been killed in Syria since the start of the war which began as an uprising and descended later into a complex civil war. More than 6.7 million people have fled the country while millions have been displaced internally.