However, Biden said the weapon was probably not fired by Russia, although the investigation was ongoing. NATO ambassadors will hold an emergency meeting on Wednesday with a news conference due around 11.30 GMT. The European common currency was then knocked off that high, falling as low as $1.028 after news of the explosion in Poland sent traders to the safety of the dollar, which also caused falls in equities. "Geopolitical risks continue to hang over currency markets and are likely to remain a key driver of volatility," she said. The greenback was also down 0.15% on the Swiss franc at 0.9418, near Tuesday's seven-month low, and the dollar index, which tracks the greenback against six main peers, was 0.24% lower at 106.26.

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