Government officials claim insurgents were behind the gas attack, but rebel groups have called the allegations "purely a lie."
The cause of the explosion was not immediately clear, said The Syrian Observatory for Human Rights.
8 year old Bana al-Abed, who fled Aleppo with the help of Twitter, visits NYC
Nine creatures were removed from "Magic World" near the war-torn city of Aleppo.
My teachers check in with me to make sure I’m still alive.
Rudayna Aksh and her daughter Dalya Zeno fled from Aleppo to Los Angeles in 2012 and moved in with Rudayna’s son Mustafa
“Movies are the most powerful empathy machine in all the arts. When I go to a great movie I can live somebody else’s life
See the exclusive trailer.
The vehicles were waiting to cross from rebel-held territory into the government-controlled city.
Here’s how the Syrian civil war unfolded, leaving 500,000 dead and displacing millions of refugees over 6 years.