TV Tokyo had the report, citing unnamed Japanese government officials.
If this comes as news to you ... well, make sure you tune in to forexlive.com a little more regularly.
As for the TV report, I get it. Folks sitting at home on the couch are not in tune with global FX so it was probably of some interest to them.
For the rest of us, though, market movements made it quite obvious that intervention took place. And then digging through the data from the BoJ confirmed it. For example:
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TV Tokyo is a Japanese television station.
(d'uh ;-) )
