The heads of the Tokyo 2020 Olympics Organizing Committee on Thursday cast doubt on a proposal by the metropolitan government to scrap three planned new venues while labeling the move "embarrassing."

Confirming reports from a day earlier, a metropolitan government task force charged with reviewing costs for the games said at a meeting that it was considering using existing sites instead of building new facilities for rowing and canoe sprint, swimming and volleyball.

It comes amid fresh estimates that the cost of hosting the 2020 Games has ballooned to ¥3 trillion.