Hotuna Da Dumi-Duminsu Daga Siriya, 30 Agusta 2013

In this citizen journalism image provided by Edlib News Network, ENN, smoke rises after explosives were dropped by a Syrian government warplane in Idlib province, August 30, 2013.

In this citizen journalism image provided by Edlib News Network, ENN, Syrians search under rubble to rescue people from houses that were destroyed by a Syrian government warplane in Idlib province, August 30, 2013.

In this image taken from video obtained from the Shaam News Network, U.N. investigators gather potential evidence in a Damascus suburb, August 28, 2013.

This citizen journalism image provided by the United media office of Arbeen shows Syrians moving a man who was allegedly exposed to chemical weapons to show him to U.N. investigators in a Damascus suburb, August 28, 2013.

This citizen journalism image provided by the United media office of Arbeen shows U.N. investigators in a suburb of Damascus, August 28, 2013.

Free Syrian Army fighters carry their weapons as they escort U.N. vehicles carrying chemical weapons experts at the site of an alleged chemical weapons attack in a Damascus suburb, August 28, 2013.

Free Syrian Army fighters deploy in Aleppo's town of Khanasir after seizing it, August 26, 2013.

Free Syrian Army fighters inspect munitions and a tank that belonged to forces loyal to Syria's President Bashar al-Assad after they seized Khanasir, August 26, 2013.

A U.N. chemical weapons expert gathers evidence at site of an alleged poison gas attack in a southwestern Damascus suburb, August 26, 2013.

An image grab taken from a video posted by Syrian activists purportedly shows a U.N. inspector speaking to a man in a Damascus suburb, August 26, 2013.

U.N. chemical weapons experts visit a hospital where wounded people affected by a suspected gas attack are being treated, in a southwestern Damascus suburb, August 26, 2013.