International Olympic Committee President Thomas Bach said Thursday that the overall costs for the 2020 Tokyo Olympics can be kept down to $15 billion (¥1.7 trillion).

At a meeting last week in Tokyo of a four-party working group reviewing the budget for the games, the 2020 organizing committee said it will try to keep costs under $20 billion. The IOC, however, said that wasn't good enough without offering a counter-figure at the time.

On Thursday, though, Bach said organizers could save a further $5 billion. The working group consists of the IOC, the organizing committee and the Japanese and Tokyo Metropolitan governments.