The broadcaster said police were carrying out an operation near Rue du Midi, a few blocks from the Grand-Place, the city’s central square.
Other eyewitnesses took to Twitter to post photos to show a police security cordon has been set up.
“Police and military ask us to stay in the hotel,” one tourist tweeted.
Some residents in the area of Rue du Midi told Xinhua that they were ordered by the police to stay home and away from the windows.
Some tweeted that the public were asked not to report police’s movements on social media. Enditem