New York - US equities jumped early on Tuesday, joining most major global bourses in rallying following strong gains in the volatile Chinese stock market.
About 30 minutes into trade, the Dow Jones Industrial Average was at 16 383.42, up 281.04 points (1.75%).
The broad-based S&P 500 gained 30.88 (1.61%) at 1 952.10, while the tech-rich Nasdaq Composite Index advanced 87.71 (1.87%) to 4 771.63.
Most equity markets in Europe and Asia posted big gains following the 2.92% rise in the benchmark Shanghai Composite Index in China.
Stocks have been volatile the last couple of weeks due to worries about the slowing Chinese economy and the possibility that the US Federal Reserve will soon raise interest rates.
Dow member Apple gained 2.8% ahead its expected launch on Wednesday of updated iPhones and an Apple TV revamp that may signal a push into online television streaming.
General Electric, another Dow component, rose 1.9% on the news European regulators approved its $12bn purchase of Alstom energy assets.
Technology companies were strong with Amazon adding 3.3%, Microsoft 3.1% and Priceline 2.0%.
US-listed Chinese stocks also outperformed: online marketplace Alibaba powered 3.2% higher and Internet search company Baidu gained 3.7%.
Media and publishing company Meredith Corporation rose 10.2% on news it will be acquired by Media General for about $2.4bn. Media General gained 3.0%.
Concordia Healthcare fell 8.3% on news it will acquire pharmaceutical company Amdipharm Mercury Limited for about $3.5bn.
Bond prices fell. The yield on the 10-year US Treasury rose to 2.18% from 2.13% on Friday, while the 30-year advanced to 2.95% from 2.89%. Bond prices and yields move inversely.