| http://www.w3.org/ns/prov#value | - Qatar is a leading supporter of the Syrian rebels fighting to oust President Bashar Assad and has been involved in mediating past hostage releases.U.S. Secretary of State John Kerry said Curtis had been held by Jabhat al-Nusra, also known as the Nusra Front, an al-Qaida-linked militant group fighting Assad's government.Curtis was not believed to be among the hostages held by the Islamic State grou
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