Core inflation in Japan's capital in October dipped below the central bank's 2% target for the first time in five months, data showed on Friday, potentially complicating the central bank's quest to raise interest rates further.

The consumer price index for the Tokyo metropolitan area rose 1.8% in October from a year earlier.

Inflation in Tokyo slowed below 2% for the first time in five months largely due to energy prices, as the country heads into a general election and the Bank of Japan mulls data for its policy decision next week.