Europe's main stock markets fell, with London's benchmark FTSE 100 index shedding 1.68 per cent to close at 5,979.20 points.
In the eurozone, the CAC 40 in Paris dropped 1.4 per cent to end at 4,501.05, points, and Frankfurt's DAX 30 fell 1.29 per cent to 9,997.43 points.
But US stocks surged higher as investors tried to snap a six-day losing streak prompted by the turmoil in the Chinese stock market.
In mid-morning trade, the Dow Jones Industrial Average stood at 15,854.51, up 1.2 per cent on new US data showing that orders for durable goods rose a solid two percent in July.
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Frazzled investors sent Europe's top indices swinging between losses and gains after a choppy session on Asian bourses, and analysts predicted even more turbulence ahead.
China's central bank had yesterday reduced interest rates and slashed the amount of money banks need to hold in reserve -- its second such tandem move in two months -- in a bid to stoke growth.
The measures are not only aimed at boosting cash flow in China, but also at reviving confidence that Beijing can steer the economy away from a hard landing and keep global growth on course.
Analysts at the Capital Economics think tank said the worst may be over.
"Looking ahead, we... Suspect that investors will be less worried about China in due course, as it becomes apparent that her economy is not collapsing," they wrote in a note to investors.
China's benchmark stock index fell 1.27 per cent to 2,927.29 points today, after veering wildly between losses and gains of around four per cent during the day.
"The equity market roller coaster continues," said TrustNet analyst Tony Cross as Frankfurt, Paris and London were down between 0.25 per cent and one per cent in mid-afternoon trades after yesterday's strong gains.
"We're still seeing some big market swings today... (but) the rate cut from (China's) central bank was clearly not enough to put investors' concerns at ease," said Craig Elam, senior market analyst with trading firm Oanda.
The new plunge in Chinese stocks sparked pandemonium on Monday, wiping about USD 2.7 trillion off global equities from London to Buenos Aires.