US stocks were tumbling Monday after China raised import duties on American pork, apples, and other products. The Dow Jones industrial average was down more than 500 points at noon Eastern, or about 2%, per the Wall Street Journal. The Nasdaq slumped 190 points, or 2.7%, and the S&P 500 dropped 58 points, or 2.2%, per the AP. Tyson Foods is among the biggest losers on Wall Street, though the tech sector was sliding as well, with investors dropping some of their recent favorites such as Microsoft. (More stock market stories.)