It's the continuation of unwinding of yen short positions following further comments from Japanese officials. This time it was the government official, which suggested the government may agree with the BOJ to change policy.
There was an upgrade in the economic assessment by the BOJ and comments from governor Fukui. From that point of view an end to the zero interest rate policy is coming closer.
The unexpectedly strong increase of the ISM service sector index, hawkish comments from Poole and expectations of strong employment data this Friday led to renewed rate rise expectations.