U.S. stocks fell on Tuesday following the release of disappointing manufacturing data. The Institute for Supply Management (ISM) reported that its manufacturing index fell to 49.4 in August, below economists’ expectations of 52. This marks the first time the index has fallen below 50 since July 2009, signaling a contraction in the manufacturing sector.

The report indicated a slowdown in new orders, production, and employment, raising concerns about the strength of the economic recovery. Investors reacted negatively to the news, with major stock indexes declining in early trading.

Analysts suggest that the weaker-than-expected manufacturing data could prompt the Federal Reserve to maintain its current accommodative monetary policy for longer than previously anticipated. The Fed has been closely monitoring economic data as it considers when to begin tapering its asset purchase program.

Here are some key takeaways from the ISM report:

• The ISM Manufacturing Index fell to 49.4 in August.
• New orders, production, and employment all declined.
• The report raises concerns about the strength of the economic recovery.

The disappointing manufacturing data adds to the uncertainty surrounding the economic outlook and could lead to further volatility in the stock market.