The post on the BOJ statement etc is here:

BOJ leaves main monetary policy tools unchanged (es expected)

USD/JPY jumped higher:

boj statement

Last week we had the (pretty wild) information come through that:

You'll recall the yen gained some ground during the week, this scuttlebutt contributed. Its also been a factor in the slide of yen on the statement - there wasn't much to suggest that talk of tightening is in any way imminent (of course it is not!).