• In this citizen journalism image provided by the Media Office Of Douma City, which has been authenticated based on its contents and other AP reporting, a Syrian man mourns over a dead body after an alleged poisonous gas attack fired by regime forces, according to activists, in Douma town, Damascus, Syria, Wednesday, Aug. 21, 2013.

    For months now, rebels, along with the United States, Britain and France, have accused the Syrian government of using chemical weapons in its campaign to try to snuff out the rebellion against President Bashar Assad.

    LAST UPDATE : Aug 22, 2013, 12:07 AM EDT
  • Syrian military soldiers stand guard at a check point on Baghdad street, in Damascus, Syria, Wednesday, Aug. 21, 2013. Syrian opposition groups claimed scores have died on Wednesday in a government offensive near Damascus, attacks in which some activists say regime troops used "poisonous gas." The government denied the reports. (AP Photo/Hassan Ammar)

    Anti-government activists accused the regime of carrying out a toxic gas attack that killed at least 100 people, including many children, during intense artillery and rocket barrages on the eastern suburbs of Damascus.

    LAST UPDATE : Aug 21, 2013, 12:00 PM EDT
  • A Damascus opposition monitoring group said 494 people had been killed in a gas attack and shelling by President Bashar al-Assad's forces. The government denies using chemical weapons.

    LAST UPDATE : Aug 21, 2013, 10:17 AM EDT
  • Composite satellite photo made available by Amnesty International on Wednesday Aug. 7 2013 of the Great Mosque of Aleppo, Syria, a UNESCO world heritage site, on March 1, 2013, left, compared to May 26, 2013, right. Amnesty claim Syrian government forces have relentlessly and indiscriminately bombarded areas under the control of opposition forces across Syria, with civilians being at the receiving end of such attacks and at the same time also being subjected to abuses by some armed opposition groups. (AP Ph

    The images have laid bare the suffering inflicted on Syria's largest city, cataloguing hundreds of damaged or destroyed houses and over a thousand roadblocks.

    LAST UPDATE : Aug 07, 2013, 11:42 AM EDT