The Japanese yen strengthened sharply against the US dollar on Thursday, July 30.
160.10 yen per dollar
The US dollar fell 2% against the Japanese yen
Traders remain alert for possible intervention by Japanese authorities to support the yen.
Japanese authorities have warned of action for months, citing currency weakness that aggravates the cost-of-living impact from high energy import costs.
The Japanese finance ministry's foreign exchange division could not be reached for comment immediately.