The two men arrested in Belgium on suspicion of planning extremist attacks over the year-end holidays are due to go Thursday before a magistrate, who will decide whether to hold them for another month.

On Wednesday, an official close to the investigation said both men belong to the same motorcycle club, the Kamikaze Riders. The person spoke on condition of anonymity as the case is still being investigated.

Later in the day, Brussels city leaders are expected to decide if the traditional New Year's Eve fireworks show should proceed or be canceled.

The suspects were arrested following searches in Brussels and other areas of Belgium. Authorities said the police actions revealed the serious threat of attacks on police, soldiers and celebrated sites in Brussels.