Heavy dollar selling
Almost everything is taking a bite out of the US dollar at the moment. There's no news to pin this on but the positive sentiment in equities is generally USD-negative.
Aside from that, it's month/quarter-end and this is the kind of thing that happens. Watch the technical levels and manage risk but be careful about drawing conclusions.
AUD/USD remains in the wedge pattern but it's gone from a one-week low to a four-day high: