There has been public outcry in China after a rabies vaccine maker was found faking production records.
Changsheng Biotechnology is accused of falsifying production data and product inspection records of its rabies vaccine.
So far there have been no cases of any harm caused by the vaccine, but the incident has still angered the Chinese government and people.
President Xi Jinping said the illegal activities were shocking, while Premier Li Keqiang urged severe punishment for the people involved, saying the incident had "crossed a moral line."
Beijing's Food and Drug Administration has launched an investigation as per the president's orders.
The firm's chairwoman and four other senior executives have been put in to custody and are being questioned.
Changsheng Biotechnology has apologized through a statement, saying it will cooperate with the probe.