Federal prosecutors announced yesterday the authorities had arrested two people suspected of plotting to attack "emblematic sites" in the Belgian capital following raids in the areas of Brussels and Liege.
A source close to the investigation told AFP a counter- terrorism judge was probing links between the "Kamikaze Riders" gang and the alleged plotters.
"The investigation is looking at this group of motorcyclists," the source said on condition of anonymity without saying whether those arrested were gang member.
The two suspects are due to appear in court tomorrow when a judge will determine whether to keep them in custody.
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The federal prosecutor's office said one of the two was arrested on suspicion of planning attacks as well as "playing a lead role in the activities of a terrorist group and recruiting for terrorist acts."
The second faced charges of planning and "participating in the activities of a terrorist group," it said.
The source close to the investigation said prosecutors were trying to determine whether the alleged plotters had direct links to the Islamic State group.
Prosecutors said the police raids on Sunday and Monday was not linked to the deadly attacks in Paris in November which were claimed by the Islamic State group and which France says were prepared in Belgium.
The Belga news agency, citing an internal police memo, said there "exists a possible and credible threat of Paris-style attacks" against the high-profile Grand Place, the neighbouring central police station as well as soldiers and police in uniform.
Belgian media reported that the city authorities will decide today whether to go ahead with a New Year's Eve fireworks display at Place de Brouckere, another central square.