Fear that Syria Rebels Used Sarin

Considering the situation, it may have been accidental. Still, it is distressing.

Del Ponte, the commissioner of the U.N. Independent International Commission of Inquiry for Syria, said the notion isn't surprising, given the infiltration of foreign fighters into the Syrian opposition. 

But rebel Free Syrian Army spokesman Louay Almokdad said rebels don't even have unconventional weapons, nor do they want any. 

"In any case, we don't have the mechanism to launch these kinds of weapons, which would need missiles that can carry chemical warheads, and we in the FSA do not possess these kind of capabilities," Almokdad said.