Reuters buzz notes that it's 2 consecutive days of action around or after the fix

Still no info on who or what is behind it but two days in a row is worth noting

EURJPY 15m chart

The moves could be anything from portfolio rebalancing to M&A deals to position adjustment ahead of the Fed. It's all part of the game. After the Fed we'll probably see a lot more action as it's also quarter end so the fixes will need to be watched more closely