Stock market news live updates: Wall St. sinks amid China's Evergrande contagion fears, US debt politics

Stocks slid Monday, with major indices tumbling by over 2% during the worst points of the afternoon session, as investors nervously eyed the potential ripple effects of the default of a major Chinese real estate company, as well as ongoing debates over the debt limit in Washington.

After defying gravity for most of the summer, September is shaping up to be a tough month for markets, with major benchmarks in retreat for a third consecutive week. At its worst point of the day, the Dow dropped by as many as 972 points, or 2.8%. However, the index closed pared losses to close lower by 1.8%, posting its worst session since July. The S&P 500 and Nasdaq each posted their worst one-day drops since mid-May.

The CBOE Volatility Index, or Vix (^VIX), jumped by more than 30% to its highest since May, as a confluence of risks roiled markets.

Shares of China Evergrande Group (3333.HK) plunged by 10% on the Hong Kong Stock Exchange as fears mounted that the Chinese real estate juggernaut would collapse under a major debt burden, impacting shareholders, bondholders and potentially triggering turmoil elsewhere across global markets. The specter of a broader crackdown by the Chinese government on Hong Kong's real estate sector further added to concerns.

"While the Evergrande situation is front and center, the reality is, stock market valuations are overstretched and the market has enjoyed too long of a break from volatility and Monday's stock market declines are not surprising," said David Bahnsen, chief investment officer at wealth management firm The Bahnsen Group, with over $3 billion in assets under management.

Meanwhile, heated debates in Washington over increasing the government's borrowing limit built on the risk-off tone in markets. U.S. Treasury Secretary Janet Yellen called for Congress to raise the U.S. debt ceiling again in a Wall Street Journal op-ed, and suggested that to do otherwise would risk leaving the government to default on payments and generate "widespread economic catastrophe."

The U.S. House is set to vote this week on the debt ceiling and a stopgap spending measure to keep the government operating past the end of the fiscal year at the end of September.

Even heading into Monday's session, the three major U.S. stock indexes had dipped so far in September amid escalating concerns over the Delta variant, pace of the economic recovery, inflation and path forward for monetary and fiscal policy. Retail sales data last week suggested the consumer was turning back towards goods rather than services spending amid the latest wave of the coronavirus, and still-weak consumer sentiment data suggested many individuals were becoming increasingly concerned about inflationary pressures.