Belgian police have made 16 arrests in anti-terror raids, but suspected Paris attacks gunman Salah Abdeslam remains at large, the authorities have said.
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.
Brussels has been on lockdown all weekend amid a manhunt for Abdeslam, who is suspected of being among the assailants who killed 130 people in Paris on Friday.
Mr Michel told reporters that authorities feared “an attack similar to the one in Paris, with several individuals who could also possibly launch several attacks at the same time in multiple locations”.