Japan's core consumer price index (CPI) for July likely rose 2.4% from a year earlier, accelerating to the fastest pace in nearly eight years and topping the central bank's 2% inflation target for a fourth month, a Reuters poll showed on Friday.

"Electricity and gas prices started to re-accelerate, while price hikes are becoming more prevalent in goods such as processed foods," said Takeshi Minami, chief economist at Norinchukin Research Institute.

Economists estimate the nationwide core CPI, which excludes volatile fresh food costs but includes energy, was 2.4% higher last month than a year earlier. That would be the fastest increase since December 2014 and follow the 2.2% annual gain seen in June.

Excluding periods when the indicator was skewed by effects of higher sales tax, the expected core CPI rise for July would be the fastest since August 2008.

While raising its core inflation projection to 2.3% for the current fiscal year, ending next March, the Bank of Japan last month kept its ultra-easy policy unchanged to support an economy still reeling from pandemic damage.

The central bank's next interest rate review is set for Sept. 21-22.

Elsewhere in the poll, July imports were seen soaring 45.7% from a year earlier on the weak yen and a commodity rally, outgrowing a 18.2% expansion in exports, according to the median estimate of 17 economists.