KATHMANDU, July 16: Arati Thapa and Ishara Karki bagged gold medals on the opening day of First Madan Bhandari School Level National Karate Championship on Sunday. Arati of Prashansha Dojo defeated Suhana Rana of Genius School in the girls’ U-20 kg category final while Sandhya Thapa and Aisha Thapa won bronze medals in the same event.