However Belgium's Prime Minister says the city's schools and underground system will re-open tomorrow.
One of the main suspects from last week's attacks in Paris is believed to be on-the-run in Brussels.
Meanwhile Police looking for Salah Abdeslam have recovered a suspected suicide belt in Paris.
It was found in a dustbin in Montrouge, where he's thought to have been on the night of the attacks – and is similar to others used.
The 26-year-old Belgian fugitive is suspected of helping organise the co-ordinated shooting and suicide bombings.
