Sweden's central bank unexpectedly lowered its interest rate to -0.35% from -0.25%. The central bank also extended its bond-buying programme by a further SEK45 billion with effect from September and until the end of 2015.

"The Eurozone economy is strengthening, but the past days' events in Greece have created a good deal of uncertainty. Consequences for the Eurozone, and for Sweden, are difficult to estimate," the central bank said.