Beijing's top procuratorate said on Thursday that the case of a 29-year-old man who died after being taken into police custody earlier this month has been delivered to the prosecuting authority in Changping district, where the death occurred.

Beijing Municipal People's Procuratorate said it had accepted a criminal report from the family of Lei Yang on Tuesday, in which they were requested to investigate the district's police officers and auxiliary officers involved in the case.

"We've reviewed the report and related materials provided by the family, but decided to hand the case to the district's prosecutors because they have done some preliminary investigations," a statement from the city's procuratorate said.