AUD/USD rally overturned, slides as low as 0.6876 from 0.6915

Last at 0.6889, teetering on edge of Bollinger uptrend channel

Wed close below 0.6875 will disengage bullish chart signal

Israel reportedly planning retaliation against Iran nS8N3LA03V

Follows massive missile strikes on Israel late Tuesday

Earlier blip up linked to China risk-on extending further

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