At least two people have been killed and four injured in blasts at two internet cafes in the city of Hefei, Chinese state media has reported.
The explosions occurred at about 0930 (1330 GMT) on Friday, Xinhua news said.
The incidents left the two cafes, which are just 10 metres apart, strewn with broken glass and debris, the Anhui Daily newspaper said on its Web site.
Small-scale explosions are common in China and are often blamed on rival business groups.
The explosions in the capital of Anhui province took place about 10 minutes apart, the Anhui Daily newspaper reported.
Witnesses in the newspaper spoke of injured people covered in blood fleeing the scene.
"This is a serious matter and the cause is still being investigated," an unnamed official at Hefei's city government office was quoted by Xinhua as saying.