The latest blast happened in the early morning in a residential building in Liucheng, a rural county of the Guangxi region, the official Xinhua news agency reported.
The six-storey building, near a neighborhood highway administrative bureau in Liucheng, the county seat, caused “some damage” according to local media reports, and Xinhua reported “bricks scattered around” the explosion site.
There have been no injuries instantly reported, in accordance with the website site CRI of China National Radio.
The radio station quoted a local resident who said he was shaken awake by the blast and “thought there was an earthquake”.
The latest unrest comes one day after 17 parcel bombs exploded in Liucheng county at multiple locations, including government offices, on Wednesday.
Police said Wednesday they were handling the blasts as a “criminal case” but ruled out a “terrorist act”.
A 33-year-old local suspect had been arrested, authorities said, providing no immediate explanation regarding a possible purpose.
The explosions, which likewise reach a shopping centre, a train station, a hospital and also a prison, were apparently placed in express delivery packages, Xinhua said.
Photos showed parts of multi-storey buildings fell and gutted, and streets littered with bricks glass and other debris.
The explosions of Wednesday came on the eve of China’s national day, the beginning of a week long holiday during which businesses and many government offices close.
Lately, several dissatisfied Chinese citizens have blasted local government offices and public places to try to attract attention for their grievances.
A guy set off some home made bombs packed with ball bearings outside a provincial government headquarters in northern China, killing a minumum of one person and wounding eight.
Liucheng, near the Vietnam border is home to about 400,000 individuals and is one of China’s poorest areas.