A former deputy chief of China's top economic planning body accepted bribes worth 2.4 billion yuan ($383 million), documents show, an amount much higher than official estimates, according to a magazine report.

The information was revealed in a lecture by a Hebei Province prosecutor organized by the local affiliate of the All-China Federation of Labor, the Beijing-based Caijing Magazine reported Wednesday.

The provincial procuratorate of Hebei issued a statement late Wednesday claiming that the prosecutor collected the lecture material from information online without official authorization. It said authorities' investigation is ongoing.

The prosecutor's lecture provided details of Liu Tienan's alleged illegal activities. They included Liu's acquisition of five apartments in Beijing, Qingdao, Shandong Province and Taiyuan, Shanxi Province, 12 passports and nine luxury watches. It also claimed that Liu used to carry 12 boarding passes with him.

Liu, 61, former deputy director of the National Development and Reform Commission, was sentenced to life in December last year over bribery charges, reported the Xinhua News Agency.

The court ruled that Liu had accepted bribes worth 35.58 million yuan from 2002 to 2012, personally or through his son.

The prosecutor also discussed the case of Gu Junshan, a former senior military logistics officer, claiming that Gu accepted bribes worth 2 trillion yuan.

Gu was charged with embezzlement, bribery, misuse of State funds and abuse of power in March 2014 in a military court, Xinhua reported.

The prosecutor said items confiscated from Gu's residence in Henan Province included two truckloads of Moutai, a high-end Chinese baijiu, traditional Chinese liquor, which was allegedly exclusively meant for the military. 

He also discussed in the document -the characteristics of corruption cases, such as corrupt officials being more likely to collude with others.

Although the public may not perceive department-level officials as powerful corrupt "tigers," their clout over the field they have control over may give rise to their corrupt practice, said the prosecutor. In particular, heads of provincial-level transportation departments are often suspected of disciplinary violations.