Belgian police have made 16 arrests in anti-terror raids, but suspected Paris attacks gunman Salah Abdeslam remains at large, the authorities have said, the BBC reports.
A total of 22 raids were carried out on Sunday across Brussels and Charleroi, prosecutor Eric Van Der Sypt said.
Brussels remains on the highest level of terror alert. Universities, schools and the metro system will stay closed on Monday.
More than 130 died and 350 were injured in the Paris attacks 10 days ago.
Police fired two shots at a car during an operation in the Brussels district of Molenbeek, injuring one suspect who was later arrested.
No weapons or explosives were found during the searches on Sunday, Mr Van Der Sypt told a news conference.
On Monday, UK Prime Minister David Cameron will hold talks in Paris with French President Francois Hollande on co-operation in the fight against the Islamic State (IS) group.
The French government says the aircraft carrier, Charles de Gaulle, will be operational in the Mediterranean on Monday and ready to act against IS militants in Syria.