The series of blasts occurred at the seat of Liucheng county and the surrounding areas, with the first one heard at about 3:50 pm local time, state-run Xinhua news agency reported.
Pictures online showed a building half-collapsed in Dapu Township. Witnesses also saw vehicles damaged on the road and people injured in the blasts.
Initial investigation showed that explosives could have been placed inside express delivery packages, the report said.
Residents said they heard explosions at about 4.45 pm, and that part of a building had collapsed, state-run CCTV said on Weibo microblogging site.