S&P500 Drops after LCH hikes Margins on Italy Bonds

UPDATE: Italian Bonds Sink As LCH.Clearnet Ups Margin Calls
From the Wall Street Journal 

The yield on the benchmark 10-year bond soared by 45 basis points to 7.12%, according to Tradeweb, above the psychological 7% mark that prompted Greece, Ireland, and Portugal to seek external assistance as funding costs became unsustainable.