Anne Wibin, the representative of the Brussels fire office, told writers on November 26 that the department had gotten a call from the mosque from a man saying they believed that they had discovered anthrax powder. Wibin confirmed that the tests verified the substance was not anthrax but it was flour.

A man accountable for mail at the mosque opened one envelope containing powder around 12:30 p.m. furthermore, following safety procedures for anthrax and immediately reached authorities. There were four ambulances responded. Seven individuals were in the room when the mail was opened and they were treated in a way that guaranteed to make sure they were decontaminated from any probable dangerous substance.

Ten envelopes with white powder were found, and experts inspected the substance, said Christian De Coninck, representative for Brussels police. The news of the white powder at the mosque came during elevated security in Brussels in the wake of the November 13 terror attacks that killed 130 individuals.

Also on Thursday, authorities brought down Brussels' terror alarm to level 3 from the highest level, a 4, that had been in effect for quite a long time. The nation is at level 3. The Brussels Intercommunal Transport Company declared Thursday that all its subway lines will reopen Friday and transport lines will operate ordinarily.

Police in Belgium have led few raids associated with the terror attacks. Specialists have focused specific consideration on a Brussels suburb, Molenbeek, with a history of connections to terrorism.

One of the suspected Paris attackers, Abdelhamid Abaaoud, was believed to have come back to the scene of the massacres in the French capital while the chaos was still unfolding. Investigators supposedly followed his cellphone to the area.

Police and decontamination teams had united at the Islamic and Cultural Center of Belgium, close to the central station of the European Union, to secure the scene. Since those assaults, which included alleged terrorists from Belgium, a formerly unknown group called Christian State has issued threats against Belgian mosques.

Approximately 500,000 Muslims live in Belgium.