Two men have been arrested in Belgium on suspicion of planning attacks in Brussels during the holidays, the federal prosecutor's office said Tuesday.
The pair were arrested after searches in the Brussels area, the Leige region, and Flemish Brabant on Sunday and Monday, the Associated Press reported.
The investigation revealed "the threat of serious attacks that would target several emblematic places in Brussels and be committed during the end-of-year holidays," the prosecutor's office said.
The Belgian capital's main square was one of the suspected targets, a source close to the investigation told AP.
"On the Grand Place, there are a lot of people, as well as soldiers and police who are patrolling, as well as a police station nearby," said the source, who spoke on condition of anonymity because he was not authorized to make public statements.
Military-type training uniforms, propaganda materials from the Islamic State group, and computer material were seized during the searches and are being examined. No weapons or explosives were found, the prosecutor's office said.
A total of six people were taken in for questioning. Four were released, but two men were placed under arrest.
One was charged with acting as the leader and recruiter of a terrorist group planning to commit terrorist offenses, the other with participating in a terrorist group's activities as a principal actor or co-actor, the prosecutor's office said.
The prosecutor's office said no additional details would be made public, but the probe was not connected to the Nov. 13 attacks in Paris.