The champions kicked off on Thursday in Sofia, Bulgaria, with 669 Taekwondo athletes from 90 countries.
Four athletes represented Iran in the first day of the championship, winning 3 medals.
Iranian girls Baraan Jamal-Livani at -29kg and Sayna Alipour at -51kg gained gold medals and the Iranian boy Mohammad-Erfan Zare at -65kg won a silver medal.
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