(File photo)

Major progress has been made in the fraud case against Changchun Changsheng Bio-tech Co, according to investigators for the State Council on Friday.

According to a journalist who witnessed the investigators in action, they sealed up and hauled away 34 documents and 1,138 pages of evidence. Investigators also recovered the actual production records of the vaccine, as well as the fabricated production records.

Investigators have seized 60 computer hard disks which were abandoned and intentionally damaged by suspected criminals.

The company was found to have violated proper procedures in manufacturing the vaccines, including using expired materials, falsely labeling production dates and improperly testing the vaccines.