SEOUL, South Korea -- South Korea's central bank cut its key interest rate Thursday for the second time this year and slashed growth forecasts as Asia's fourth-largest economy faces mounting threats from the protracted debt crisis in Europe and a worsening global slowdown.

The Bank of Korea's seven-member policy board lowered the benchmark seven-day repurchase rate by a quarter of a percentage point to 2.75 percent. The bank cut its growth forecast for this year to 2.4 percent from 3 percent. It lowered its forecast for next year to 3.2 percent from 3.8 percent.