Summary Box: Treasurys skyrocket on ongoing European debt worries; 10-year yield at 3.40 pct

Summary Box: Bond prices soar as stocks plunge

GREECE WORRIES: Interest rates plummeted in the bond market Thursday as stocks swooned on the latest worries about Europe’s debt crisis, particularly in Greece. That pushed up demand for Treasurys.

STOCKS SINK: The Dow Jones industrials fell 348 points. The stock slump increased demand for safe investments.

FALLING RATES: The yield on the benchmark 10-year Treasury note sank to 3.40 percent from 3.54 percent. The 10-year yield is tied to mortgages and other consumer loans.