The Belgian Public Prosecutor has charged four people with active corruption and criminal organisation, and one person with money laundering, following house searches that took place on Thursday 13 March.
The 21 house searches were carried out in connection with suspected illegal lobbying conducted by Huawei officials in the European Parliament.
The four people charged with active corruption and criminal organisation have been placed under an arrest warrant. Their pre-trial detention was extended on Tuesday by the Pre-trial Chamber.
The fifth individual has been released under conditions.
In a press release, the Public Prosecutor added that additional searches had taken place at the European Parliament on Wednesday. Some of the premises had already been placed "under judicial seal" since Thursday.
The federal investigation into the Huawei affair is ongoing. The Public Prosecutor said it would not comment further on the case for the time being.
