![130908090410-01-syria-0907-restricted-horizontal-gallery.jpg](http://i2.cdn.turner.com/cnn/dam/assets/130908090410-01-syria-0907-restricted-horizontal-gallery.jpg)
Issa, 10, carries a mortar shell in a weapons factory of the Free Syrian Army in Aleppo, Syria, on Saturday, September 7. Issa works with his father in the factory for 10 hours a day, six days a week.
Could the rebels be the ones using chemical weapons in Syria? The rebels have motive, means and opportunity.
There's little doubt Syrians suffered a chemical attack last month.
But videos of the aftermath -- including 13 shown to Congress -- do nothing to show who was responsible.
Obama says he has "high confidence" that the regime is to blame -- the strongest position short of confirmation. But his administration has not released hard evidence.
http://edition.cnn.com/2013/09/09/world/syria-us-evidence-chemical-weapons-attack/