TOKYO, May 2 -- NHK World issued the following news:

The Japanese yen briefly strengthened to 153 against the dollar on the New York market on Wednesday, prompting speculation of market intervention by the Japanese government and the Bank of Japan.

The Japanese currency's surge of more than 4 yen from the 157-yen range followed a news conference by US Federal Reserve Chair Jerome Powell.

Currency traders say it is highly likely that Japan's central bank intervened, but Japan's Vice Minister of Finance for International Affairs Kanda Masato said he had no comment on the yen's move.

Helen Given, a foreign-exchange trader at Washington-based Monex USA, told NHK that traders typically expect to see a swing of two whole yen in the case of in...