Several small bombs exploded in front of a Communist Party building in the northern Chinese city of Taiyuan on Wednesday, killing one person and injuring another eight, state media said.
The official Xinhua news agency said what appeared to be small-scale bombs went off outside an office building of the Shanxi Provincial Committee of the Communist Party. Taiyuan is the capital of Shanxi province.
"Judging from the scattering of small metal balls, it is suspected that improvised bombs exploded," the news agency said.
There was no immediate explanation for the attack. But such incidents are not uncommon in China and underscore the government's worries about stability in the world's second-largest economy, with a widening gap between rich and poor and growing anger at corruption and environmental issues.
Photos circulated on Chinese social media sites showed smoke filling the wide avenue where the party office is located and vehicles with blown out windows. Emergency trucks were parked outside what appeared to be undamaged buildings.
Xinhua cited residents as saying people in the area scattered after as many as seven blasts went off.
The microblog of the official People's Daily newspaper said one person had been killed and another eight were injured, including one person with serious injuries.
The Chinese government blamed Islamists for an attack in central Beijing last week when a car ploughed through bystanders on the edge of Tiananmen Square and burst into flames, killing three people in the car and two bystanders.
The incidents come as China ramps up security before top leaders gather on Saturday for a plenum meeting in Beijing to discuss key reforms.
A 42-year-old farmer with terminal lung cancer detonated a home-made device aboard a bus in Fujian province in 2005, injuring 31 and killing himself, possibly to protest prohibitive healthcare costs.