The 3-year high in USD/CAD along with the rally in stock markets set off a cascading round of dollar buying.
The breaks of 1.36 in EUR/USD and 0.8900 in AUD/USD have been the secondary moves but this kind of stop-driven trading is often difficult to sustain. Demand down to 1.3595 remains in EUR/USD and 0.8880 in AUD/USD.