An explosion hit a residential building in Liuzhou city in south China’s Guangxi province early Thursday, the day after parcel bombs killed at least seven in the same city, China’s state media said.
The blast occurred at around 8 am (0000 GMT), scattering bricks from the six-storey building, the official Xinhua news agency reported.
There were no immediate reports of casualties. Police and firefighters were sent to the scene.
At least 51 people were injured and two are still missing from the multiple explosions Wednesday afternoon, according to Xinhua.
Some 17 blasts in the Liucheng area of Liuzhou were caused by explosives hidden in parcels, Chinese media reports quoted the local police as saying.
A 33-year-old man from Guangxi identified only by his surname Wei was arrested on suspicion of causing the blasts, police said.
The suspect had hired others to help deliver letter bombs, police said Thursday.
Police have not commented on the suspect’s possible motive and said further investigation was under way.
The Liuzhou branch of state-owned mail delivery company China Post has halted all its mail deliveries until Saturday.
Police also warned the public not to accept materials delivered by strangers or via unofficial channels.
Explosives and small bombs are regularly used in response to personal or professional disputes in some parts of China in what state media refer to as revenge attacks.