Stocks fell on Wednesday as investors fretted over the possibility of China halting its Treasury bond purchases and the U.S. pulling out of NAFTA.

The declined 0.1 percent to close at 2,748.23. Utilities and real estate were the worst-performing sectors on the index. The Nasdaq composite finished 0.1 percent lower at 7,153.57. Both indexes snapped a six-day winning streak, posting their first negative close of 2018.

The Dow Jones industrial average fell 16.67 points to 25,369.13. The index had fallen 128.81 points at its session lows.

Bloomberg News reported Wednesday, citing people familiar with the matter, that officials in Beijing have recommended the Chinese government lowers — or even stops — its buying of U.S. sovereign debt.

The report also notes that Chinese officials think U.S. debt is becoming less attractive compared to other assets, adding that trade tensions between the two countries could provide a reason to slow down or halt the purchases.