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©AHMED MARDNLI/EPA/MAXPPP - epa07491513 A Syrian boy plays in a park in Raqqa city, northeastern Syria, 01 April 2019 (issued 08 April 2019). The US-backed Syrian Democratic Forces (SDF) announced on 18 October 2017 that they have seized the majority of the northeastern Syrian city of al-Raqqa concluding a campaign that began on 06 June to liberate the city, former capital of the self-proclaimed caliphate by the so-called Islamic State (IS or ISIS) terror organization in 2014.