The anonymous caller added that he disagreed with the paper’s coverage of the terrorist attacks in France.
Police and sniffer dogs searched the premises on the Koningsstraat and cordoned off the street outside the building.
They gave the all clear around 8pm.
The newsrooms of the paper La Capitale and Soir Mag that are located in the same offices were evacuated too. The publishing group’s printing works located in Nivelles was also evacuated.
The threatening telephone call came as thousands of people marched through the streets of Brussels in support of freedom of expression and against hatred following three days of terror in France.
Le Soir journalists went onto the microblogging website Twitter to insist that they would be putting out a paper on Monday.
The newsroom switched to a neighbouring hotel for a while.
Flandersnews.be / Expatica