The town's main hospital said ten people were killed including a 12-year-old boy due to two missiles loaded with deadly sarin gas targeting their neighborhood, Zaman Al Wasl wrote.

Moadamiyet al-Sham, also known as Moadamiya, has been under major attack by regime army this week after the collapse of a fragile truce with rebels and more than two years of suffocating siege.

Read alsoReuters Exclusive: Chemical weapons used by rebels in Syria – sourcesLocal activists said regime's sarin gas attack is a flagrant assault on civilians which defies all international conventions since the deadly 2013 chemical attacks.

The Bashar al-Assad regime was responsible for the sarin chemical attack at Eastern and Western Ghouta near Damascus, on August 21, 2013, where more than 1,500 people had been killed, including dozens from Moadamiya town.