The last three of the six people arrested during raids on Thursday in and around the Belgian capital "have been released after interrogation," the federal prosecutors office said in a statement.
The first three in the group were already released hours after their arrests on Thursday, AFP reported.
The prosecutors office confirmed that two men who had already been formally charged with terrorism-related offences remain in custody.
It has identified the men as Said S., 30, and Mohammed K., 27.
The mens lawyers said their full names are Said Saouti and Mohammed Karay, whose arrests were announced Tuesday following police raids in and around Brussels and the eastern city of Liege.
Belgian authorities cancelled the annual New Years Eve fireworks display and other events in the heart of Brussels after revealing an alleged jihadist plot to attack "emblematic sites" in the capital during the holiday.
The city of 1.2 million people has been on high alert since France said several men involved in the deadly November 13 attacks in Paris had links to Brussels, which is home to the headquarters of the European Union and NATO.
The prosecutors office said the two men already formally charged over the end-of-year plot had been ordered by a court to be detained for another month.
It said Said S. has been charged with "threatening terrorist attacks" as well as playing a leading role in the activities of a terrorist group and recruiting potential attackers.
Mohammed K. faces similar charges.
Their lawyers told reporters outside the courthouse that their clients denied the charges.
Belgian broadcaster RTL said Saouti founded the motorcycle club called Kamikaze Riders and that Karay was also a club member.
It said club member Abdelouafi Elouassaki died in a road accident in 2013, but added that several of his brothers had gone to fight in Syria.
Prosecutors said the alleged New Year plot is not connected to the November Paris attacks where jihadists, including several linked to Belgium, killed 130 people.
Editor: Priyambodo RH
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