The Swedish crown and 10-year government bond yields dropped to two-month lows on Wednesday after Sweden's central bank expanded its asset purchase program and vowed to intervene in the currency market if an upturn in inflation is threatened.

The Riksbank held its benchmark repo rate unchanged at -0.35 percent, as expected, and said it would expand its bond buying program by 65 billion Swedish crowns ($7.65 billion) to a total of 200 billion crowns.