The Japanese yen in New York gained more than 3% near the end of the market to 153.04 to a US dollar, while the market estimated that the Japanese authorities will intervene the FX market.
In this morning (2nd)'s Asian trading session, the Japanese yen gave back part of the gains, and last dropped 0.7% to 156.197
Japan's Chief Foreign Exchange Officer Masato Kanda refused to respond to whether Japan had meddled with the FX market.