BREAKING: Dow plunges more than 250 points at the open on disappointing earnings, economic reports

A wide range of companies such as big-machinery maker Caterpillar and consumer products giant Procter & Gamble slashed their sales and profit forecasts for 2015, moves that signaled the weak global economy and strong dollar could dent U.S. growth and profits this year. FOR MORE ON THIS STORY, GO TO:   USATODAY.COM