Anhui police promised Monday to continue investigation into a teenager assault after the victim's mother posted a desperate note for help on the Internet.
Police said the suspect, a 17-year-old boy surnamed Tao, had been detained since last September in Hefei for allegedly setting fire on a girl who turned him down.
Police previously claimed they could not proceed with investigation because hospitalization of the victim had postponed forensic tests.
The case caused a public outcry after the victim's mother went online last week to call for help, describing the gruesome details of the assault and posting photos of her daughter's bandage-wrapped face.
A hospital diagnosis indicated that about 32 percent of girl's body had been burned.
Tao and the girl, surnamed Zhou, both studied in a middle school in Hefei, capital of Anhui Province. Zhou had been shunning Tao before her parents even got her on sick leave for a year and arranged for her to transfer schools to avoid the boy.
Frustrated and angry, Tao, the son of a low-level functionary couple, went to Zhou's home, poured gasoline on her face, and lit it with a lighter. Zhou's aunt heard screams and came to rescue, putting the fire out and rushing Zhou to hospital. Tao was arrested the following day.
Zhou's mother said in the online note that the family had been struggling to pay for the costly treatment and she hoped the case could be processed faster so the family could soon get the compensation to cover the treatment.