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(Image: Getty)

Police raided various addresses in Brussels, Liege and the Brabant region on Sunday and Monday in a bid to thwart the attacks.

Military clothing and ISIS propaganda materials were seized in the raids.

Belgium has been on high alert since the Paris attacks, which killed 130 people.

It comes after reports that London is braced for a shooting or bomb attack on or before New Year's Eve after Austrian police warned of a possible Jihadi plot.

Several of the perpetrators are thought to have been based in Belgium.

(Image: AP)

The federal prosecutor's office said there was a "threat of serious attacks that would target several emblematic places in Brussels and be committed during the end-of-year holidays."

Six people were taken in for questioning but four have already been released.

Two have been arrested on suspicion on participating in the activities of a terrorist group.

The prosecutor's office said the investigation was not connected to the November 13 attacks in Paris in which ringleader Abdelhamid Abaaoud and fugitive Salah Abdeslam had links to Belgium.

(Image: Facebook)

Two of the Paris suicide bombers, Brahim Abdeslam and Bilal Hadfi, had been living in Belgium.

Belgian police have arrested nine people in connection with the Paris attacks.

Brussels was placed under a four-day lockdown last month, closing universities, schools and the metro network as fears of a Paris-style copycat attack.