U.S. stocks tumbled Monday after China raised import duties on U.S. pork, apples and other products. Technology companies took some of the worst losses, and while it's too soon to call it the beginning of a trade war, investors aren't sticking around to find out if one is coming.

On Monday:

The S&P 500 index skidded 58.99 points, or 2.2 percent, to 2,581.88.

The Dow Jones industrial average declined 458.92 points, or 1.9 percent, to 23,644.19.

The Nasdaq composite dropped 193.33 points, or 2.7 percent, to 6,870.12.

The Russell 2000 index of smaller-company stocks sank 36.90 points, or 2.4 percent, to 1,492.53.

For the year:

The S&P 500 is down 91.73 points, or 3.4 percent.

The Dow is down 1,075.03 points, or 4.3 percent.

The Nasdaq is down 33.27 points, or 0.5 percent.

The Russell 2000 is down 42.98 points, or 2.8 percent.