Prosecutors arrested a former operations executive with the Tokyo Olympics organizing committee and three others on Wednesday over bid-rigging allegations, as yet another corruption scandal surfaces in the wake of the global sports event.

Tokyo prosecutors arrested the former executive, Yasuo Mori, on suspicion he played a leading role in rigging bids for contracts related to Games test events in violation of the anti-monopoly law.

They also arrested Koji Hemmi, a former executive with Dentsu, and officials Yoshiji Kamata and Masahiko Fujino from event production companies Cerespo and Fuji Creative, both firms that won contracts to plan test events.