Authorities in Belgium have conducted a series of anti-terrorism raids and arrested 12 suspects, the prosecutor's office said Saturday.
The overnight raids were conducted in 16 municipalities, including in the area of Molenbeek, in dozens of houses and garages, the prosecutor said. No weapons or explosives were found.
Some 40 people were taken in for questioning, which included the 12 arrested.
Additional details were not immediately known.
On Wednesday, Belgium's threat analysis unit maintained the state of alert for the country at Level 3 - the second highest - the Belga news agency wrote, amid unconfirmed media reports that extremists were planning new attacks on Belgium and France.
More than 30 people died on March 22, when suicide bombers attacked the Brussels international airport and an underground station in the Belgian capital. Several suspects have since been linked to the terrorist attacks in Paris in November in which 130 were killed.