NEW YORK — A monthslong calm on Wall Street shattered on Friday, and U.S. stocks are falling after President Donald Trump threatened to crank tariffs much higher on China.

The S&P 500 sank 2.1 percent and was tumbling toward its worst day since April. The Dow Jones Industrial Average was down 668 points, or 1.4 percent, with an hour remaining in trading, and the Nasdaq composite was 2.8 percent lower.

Searchable stock index

Stocks had been heading for a slight gain in the morning, until Trump took to his social media platform and said he’s considering “a massive increase of tariffs” on Chinese imports. He’s upset at restrictions China has placed on exports of its rare earths, which are materials that are critical for the manufacturing of everything from consumer electronics to jet engin

See Full Page