BRUSSELS (TIP): Six people have been detained in raids around Brussels linked to this week’s attacks on the city’s airport and subway system, Belgian prosecutors said. In a statement late on March 24, federal prosecutors said that the arrests were made during raids in central Brussels, Jette and the Schaerbeek neighborhood. “It will be decided tomorrow if an arrest warrant (charges) are brought against these people,” spokesman Eric Van der Sypt told AFP.

Earlier this week, police found a large stash of explosives and other bomb-making material in an apartment in Schaerbeek believed used by the suicide bombers.

Schaerbeek residents described hearing detonations during the police raids. It was unclear whether they were explosions or controlled detonations.

Also March 24, a man who had been in the “advanced stages” of a plot to launch a terror attack in France was arrested in a Paris suburb, CBS News reported.

French interior minister Bernard Cazeneuve said there were no links “at this stage” between the plot and the attacks against Brussels this week or Paris in November.

Authorities lowered Belgium’s terror-threat level by one notch Thursday, although they said the situation remained grave and another attack is “likely and possible.”

Belgium had been on its highest alert ever since Tuesday’s bombings in the Brussels airport and subway that killed 31 people and wounded 270.