China's third-quarter economic growth slowed to its weakest pace since the global financial crisis and missed expectations as a multiyear campaign to tackle debt risks and the trade war with the United States began to bite.

The economy grew 6.5 percent in the third quarter from a year earlier, slower than the second quarter, the National Bureau of Statistics said Friday. Analysts polled by Reuters had expected the economy to expand 6.6 percent in the July-September quarter.

The GDP reading was the weakest year-on-year quarterly growth since the first quarter of 2009 at the height of the global financial crisis.