The trading on Wall Street was initially modest, only to later turn downward on Wednesday and land in the red.
The Dow Jones industrial index dropped 1.9 percent, the S&P index lost 1.6 percent, and the technology-heavy Nasdaq index fell back 1.4 percent.
According to Bloomberg, the lukewarm interest at an auction for government bonds with 20-year maturities contributed to the downward movements.
The economic stability has been under scrutiny since the credit rating agency Moody's downgraded the US credit rating.
Among Wednesday's winners were, among others, Google's parent company Alphabet, up 2.9 percent.
Technology giants such as chip manufacturer Nvidia and Apple fell 1.9 and 2.3 percent, respectively. Electric car manufacturer Tesla lost 2.7 percent.
