* Norway's Warholm demolishes 400m hurdles world record * Biles to return, seeks triumphant Olympic finale after tumult * Laurel Hubbard out, makes history as transgender Olympian By Karolos Grohmann and Mitch Phillips TOKYO, Aug 3 (Reuters) - The Olympics governing body was probing Belarus's treatment of an athlete seeking refuge, while Norway's Karsten Warholm demolished a world record and Simone Biles was set for a highly anticipated return to the gymnastics stage in Tokyo on Tuesday. The International Olympic Committee (IOC) said it expected a report https://www.reuters.com/article/olympics-2020-ioc/update-1-olympics-ioc-awaiting-report-from-belarusian-olympic-committee-idUSL8N2PA0F4 later in the day from the Belarusian team on the case of sprinter Krystsina Tsimanouskaya, who sought protection https://www.reuters.com/lifestyle/sports/belarus-athlete-in-hands-authorities-ioc-2021-08-02 in the Polish embassy in Tokyo on Monday after refusing her team's orders to fly home.