Damascus

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In this photo made on Thursday, May 1, 2014, Damascus Opera House director Lama Sallouh walks through the empty theater in Damascus, Syria. Two art students were killed and five others were wounded when a mortar landed outside the Opera building in April 2014.(AP Photo/Dusan Vranic)

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In this Sunday, May 4, 2014 photo, a death notice for musician Wessam Khawees is seen on a message board at art school which adjoins the Damascus Opera House in Damascus Syria. Wessam was killed in a mortar attack on Damascus' outskirts. (AP Photo/Dusan Vranic)

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Sigrid Kaag of the Organization for the Prohibition of Chemical Weapons speaks during a press conference in Damascus, Syria on Sunday, April 27, 2014. Kaag told reporters in Damascus that 92.5 percent of Syria's chemical materials had been removed from the country and destroyed. She described it as “significant progress,” though she says the government needs to ensure the remaining materials are eradicated by the end of the month. (AP/Photo)

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Members of a U.N. investigation team take samples from sand near a part of a missile that is likely to be a chemical-weapons rocket, according to activists, in the Damascus countryside of Ain Terma, Syria, on Wednesday, Aug. 28, 2013. (AP Photo/United Media Office of Arbeen) ** FILE **