A key stock market index in Hong Kong saw the biggest single-day drop since the financial crisis on Tuesday. The Hang Seng index fell by -2172.99 (-9.41 percent) on Tuesday. The drop followed an announcement on Tuesday by China's economic planning agency that outlined details of measures aimed at boosting the economy but refrained from major spending initiatives.

Wall Street held firm even though stock markets around the world sank after scary swings in China, as euphoria about possible stimulus for the world’s second-largest economy gave way to disappointment. Stocks tumbled 9.4% in Hong Kong, marking their worst day since the 2008 global financial crisis.

The CSI 300 Index pared gains after registering a record intraday jump while the Hang Seng Index slumped the most since 2008.

Hong Kong's stock market suffered its worst day in 16 years Tuesday and oil prices slid as a strong rally thanks to China's planned economic stimulus faded.

The group of tech stocks known as the “Magnificent Seven” all rose on Tuesday, with the largest gain in tech stocks going to Nvidia, up 4.1%.

China is back to work after the fall "Golden Week" holiday, and the sheen is coming off a recent market rally. A briefing from the country's top economic planner, the National Development and Reform Commission,

Wall Street steadies as oil prices drop, offsetting Hong Kong's worst stock market day since 2008. The S&P 500 and Nasdaq rise, while global markets react to China's economic measures.