A Syrian military airstrike killed more than 40 people in a rebel-held area near Damascus on Friday, a monitoring group and opposition activists said.
The Local Coordination Committees, a grassroots opposition group, reported on its Facebook page that the strike hit a public square in Hamoria where people were leaving a mosque after Friday prayers.
Syria's air force has launched daily airstrikes against rebel-held civilian areas throughout the country’s devastating civil war, which started after security forces cracked down on peaceful pro-democracy protests in 2011.
Russia, an ally of Syrian President Bashar al-Assad, has offered to host peace talks later this month, but most key opposition groups have said they do not trust Russia's intentions and will likely not attend.
On Tuesday, a Syrian military airstrike on a cattle market in territory controlled by the hardline Islamic State in Iraq and the Levant (ISIL) group killed 43 people, according to the observatory. Nasir Haj Mansour, an official in the Kurdish administration that controls nearby areas, said the death toll was much higher, around 70.
"The strike, according to our information, was painful for Daesh, in addition to civilians," he told Reuters by Skype, using an Arabic acronym for ISIL, which is fighting the governments of Syria and neighboring Iraq.
An estimated 200,000 people have been killed in more than three years of fighting in Syria, according to the United Nations.
Al Jazeera and Reuters