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The dollar held its sharpest gain in a week on Wednesday after an Iranian missile attack on Israel drove buying of safe assets as investors fretted about the widening of conflict in the Middle East.

The dollar held its sharpest gain in a week on Wednesday after an Iranian missile attack on Israel drove buying of safe assets as investors fretted about the widening of conflict in the Middle East.

Early Asia moves were slight, leaving the euro below $1.10 following its largest drop in nearly four months overnight.

The bid for safety kept the yen broadly steady at 143.45 per dollar and the Swiss franc at 0.8463 per dollar. The New Zealand dollar was nursing a 1.1% overnight fall at $0.6283 and oil prices had jumped 2.5%.

The U.S. dollar index rose about 0.5% overnight to 101.2, its largest rise since Sept. 25, which was also helped by a stronger-than-expected reading on U.S. job openings.

Israel said Iran fired more than 180 ballistic missiles and Iran's Revolutionary Guard Corps said the attack was retaliation for Israeli killings of militant leaders and aggression in Lebanon against the Iran-backed armed movement Hezbollah.

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