China's industrial output rose 6.0 percent year-on-year in April, the government said on Saturday, moderating from the previous month, raising questions over the strength of a rebound in the world's second-largest economy.

Separately, retail sales rose 10.1 percent on the year in April while fixed asset investment -- an indicator of government spending -- rose 10.5 percent in the January-April period, the National Bureau of Statistics said.