Taken in Homs earlier this year. The rest of the country has further deteriorated as a result of the unrest. (Creative Commons)

According to Reuters, if the report is confirmed, this will be one of the more deadly clashes since the beginning of the country's civil war 21 months ago. In that time, the rebels say, 44,000 people have been killed. 

Raw video, thought to be of this most recent attack, has been circulating since the initial reports, showing badly injured bodies outside of a damaged building.

According to the Syrian Observatory for Human Rights, several other incidents of violence arose around the country Sunday, including an air strike in northern Aleppo province which killed 13 people and a jet attack on Saqba, north of Damascus. The Observatory estimated some 180 people had been killed.

United Nations Special Envoy Lakhdar Brahimi, who arrived in Damascus just as news of the air strike broke, is expected to meet with Syria's foreign minister and President Bashar al-Assad during his visit.

Read the full story here, and more of Neon Tommy's Syria coverage here. 

Reach Executive Producer Catherine Green here. Follow her here.