The 26-year-old will defend his title in Paris, having made history in Tokyo three years ago with India's first Olympic track and field gold ever.
In a statement, Tokyo prosecutors said they arrested Yasuo Mori, 55, a senior Tokyo 2020 organising committee official, for allegedly violating the anti-monopoly law.
The Japanese government has decided to scrap its controversial design for the stadium for the 2020 Tokyo Olympics and Paralympics.
