A number of streets were sealed off and people were escorted back to their homes by the police while public transport was also halted.
Fri, March 25, 2016REUTERS
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Damage seen inside the departure terminal following the March 22, 2016 bombing at Zaventem Airport, in these photos made available to Reuters by the Belgian newspaper Het Nieuwsblad
There is speculation that the operation is linked to terrorism investigation.
According to Belgium press, one armed person was arrested during the lockdown.
A police officer said: "Several streets have been blocked, operations are in progress, but we will not give any details tonight."
The police lifted the lockdown at around 8pm.
RTL
Several streets have been blocked, operations are in progress, but we will not give any details tonight
Police officer
One Twitter user said: “Lock down in our part if Brussels. Police sent me back in. Lots of sirens out there.”
In October, two Belgian police officers were attacked in Schaerbeek in an incident classified as a suspected terrorist act.
The political journalist, Thomas Gadisseux, tweeted: "Terrorist operation happening in Schaerbeek near to the Liedts place. A large number of police officers have been deployed since the beginning of the day."
EPA
Schaerbeek is just five kilometres away from the principally Muslim area of Molenbeek where the Abdeslam brothers lives, who were behind the Paris terrorist attacks.
A press announcement is due to take place at 11am tomorrow morning with more information about the police operations.