MILAN: Italy's borrowing costs rose in an auction of five and 10 year bonds on Friday that raised six billion euros ($8.0 billion), amid tensions after a two-notch downgrade in Spain's sovereign debt rating.

The rate on bonds due in five years rose to 4.86 percent and the 10-year rate hit 5.84 percent compared to rates of 4.18 percent and 5.24 percent registered in a similar auction last month.

Dow Jones Newswires contributed to this report