Dow drops 500 points after U.S. economic growth slows: Live updates CNBCGDP growth slowed to a 1.6% rate in the first quarter, well below expectations CNBCWhy GDP report is 'worst of both worlds' for markets MarketWatchU.S. Economic Growth Slows to 1.6%, Inflation Stays Firm The Wall Street JournalU.S. Economy Grew at 1.6% Rate in First-Quarter Slowdown The New York Times