LONDON: Italian and Spanish 10-year government bond yields rose on Thursday as Federal Reserve's signal that it may soon trim its monetary stimulus hit euro zone debt across the board.

Italian 10-year yields were last 15 basis points higher at 4.41 percent, while equivalent Spanish yields rose 18 bps to 4.70 percent. Portugal underperformed, with its 10-year yields rising 30 bps to 6.39 percent.