Finance Minister Satsuki Katayama declined to comment on alleged yen‑support intervention despite Bloomberg estimating $34.5 billion spent.
Yen rallied sharply after hitting a low of ¥160.72 per dollar, with thin Golden Week trading heightening volatility risk.
Official data showed no FX market entry through April 27, leaving a month‑long window before next disclosure on possible later‑month action.
Katayama, alongside Atsushi Mimura and BOJ Deputy Governor Ryozo Himino, warned traders of excessive moves while attending regional conferences.