Another blast rocked the city of Guangxi in China on Thursday, a day after a series of explosions left seven people dead in the area. 

Thursday's blast hit a residential building at around 8 am local time. Casualties are not known. 

On Wednesday, at least 17 'letter bombs' exploded in multiple locations in the Guangxi Zhuang Autonomous Region in south China, damaging buildings and vehicles and injuring over 50 people. Two people are still missing after the blasts hit a shopping mall, a dormitory and a bus station. 

The explosions led to a temporary suspension of parcel services in the Liucheng province, as the explosives were said to be kept in parcels.

A 33-year-old suspect has been detained, Xinhua news agency reported.