The terror threat was raised after police killed a suspected terrorist on the A8 Motorway during a shooting incident last week. Later, the house of the man in Anderlecht was searched and a number of weapons and military items were found, enough to carry out a terrorist attack.
Police also found a list with names of magistrates and police detectives in the house. The 39-year-old victim of the shooting, a man of Algerian descent, was suspected of having links with terrorist organisations.
The counter-terrorism unit OCAD has analysed the situation and decided that safety measures should be stepped up. It is not clear whether individual people have also received protection.