Citizens of the Belgian capital were urged to avoid crowded areas due to reports of an "imminent threat" as Belgium-based jihadists have been increasingly linked to the devastating attacks in Paris.
Investigators are working around the clock to track Salah Abdeslam, one of the gunmen who is still on the loose after a coordinated wave of attacks on Parisian nightspots that left 130 dead.
The carnage has put all of Europe on edge as it emerged dangerous jihadists slipped between countries unnoticed, prompting the EU to rush through reforms to tighten border checks in its cherished passport-free Schengen zone.
The United Nations Security Council yesterday authorised nations to "take all necessary measures" to fight Islamic State jihadists and other extremist groups after a wave of terror attacks across the world that has left hundreds dead in recent weeks.
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The UN resolution came as jihadist gunmen with an Al-Qaeda branch besieged a luxury hotel in the Malian capital of Bamako killing 21 people.
Mali was struck a week after Paris and Beirut -- where 44 where killed in IS bombings -- and three weeks after IS downed a Russian plane killing 224 people.
Outside La Belle Equipe restaurant where 18 were gunned down, a crowd stood under a light rain around a heap of flowers and candles singing the Marseillaise anthem before whooping and yelling at the top of their voices at 9:20 PM (local time), when the attacks started.
Benoit Seblain, drinking a beer at a cafe not far from the Bataclan where 89 people were massacred, admitted he was "a bit afraid."
The country has been shaken to its core by a dramatic week which began with the attacks and saw a violent shootout between police and jihadists holed up in a Paris apartment.
Suspected attack ringleader Abdelhamid Abaaoud was killed in the police assault along with his cousin Hasna Aitboulahcen and an unidentified suicide bomber.