A tank is seen at the battlefront of Jobar, near the capital of Damascus, on Aug. 24, 2013. Some Syrian soldiers on Saturday suffered suffocation after rebel militants released chemical substance around their hideouts near Damascus, the state-TV reported. (Xinhua/Bassem Tellawi)

Syrian soldiers are seen at the battlefront of Jobar, near the capital of Damascus, on Aug. 24, 2013. Some Syrian soldiers on Saturday suffered suffocation after rebel militants released chemical substance around their hideouts near Damascus, the state-TV reported. (Xinhua/Bassem Tellawi)

Syrian soldiers are seen at the battlefront of Jobar, near the capital of Damascus, on Aug. 24, 2013. Some Syrian soldiers on Saturday suffered suffocation after rebel militants released chemical substance around their hideouts near Damascus, the state-TV reported. (Xinhua/Bassem Tellawi)

Chenmical reagents are seen at an arsenal of Syrian rebel militants in Jobar, near the capital of Damascus, on Aug. 24, 2013. Some Syrian soldiers on Saturday suffered suffocation after rebel militants released chemical substance around their hideouts near Damascus, the state-TV reported. (Xinhua/Bassem Tellawi)

Syrian soldiers are seen at the battlefront of Jobar, near the capital of Damascus, on Aug. 24, 2013. Some Syrian soldiers on Saturday suffered suffocation after rebel militants released chemical substance around their hideouts near Damascus, the state-TV reported. (Xinhua/Bassem Tellawi)

Syrian soldiers are seen at the battlefront of Jobar, near the capital of Damascus, on Aug. 24, 2013. Some Syrian soldiers on Saturday suffered suffocation after rebel militants released chemical substance around their hideouts near Damascus, the state-TV reported. (Xinhua/Bassem Tellawi)