New Zealand shares opened just under 1 per cent lower in response to the meltdown on Chinese markets and weakness on Wall Street.
After 15 minutes' trading the NZX50 index was down by 41 points or 0.71 per cent at 5,726.6 on light trading volume.
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In the US, mounting fears that China's problems could spread drove the Dow Jones industrial average down by 261.49 points, or 1.47 percent, to 17,515.42. Wall Street trading was also disrupted after a technical outage forced a three hour trading suspension.
There were problems at the New York Stock Exchange overnight after trading was stopped because of a technical problem, though NYSE-listed shares continued to trade on other exchanges.