(CNBC) — Stocks fell on Monday as bond yields resumed their August downturn, raising concerns about the state of the economy.

The benchmark 10-year Treasury yield, which fell to its lowest since 2016 last week, dipped to 1.63%. The spread between 2-year and 10-year Treasury yields narrowed to only 6 basis points on Monday, near its lowest level since 2007.

Dow Jones Industrial Average fell 391 points, or 1.49%, to 25,896.44, while the S&P 500 dropped 36.21 points, or 1.24%, to 2,882.44 and the Nasdaq Composite is down 1.2% to 7,863.41. It was the second down day in a row for the market, which had staged a remarkable recovery last week until the selling returned again on Friday.

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