Belgian police have arrested six people in Brussels as a major investigation continues into attacks that claimed 31 lives in the city on Tuesday.
The arrests were made in the Schaerbeek district. There is no word yet on the identities of the suspects or their possible connection to the attacks.
Separately, in France, a suspect who was plotting an attack has been arrested near Paris.
The Brussels bombings have been linked to last November's Paris attacks.
So-called Islamic State (IS) has claimed the attacks in both Paris and Brussels.
Residents said they heard explosions during the police raids but the cause was unclear.
Belgian media reports on Friday suggest a seventh arrest was made in the Forest district of Brussels.
Also on Thursday evening, French police launched an anti-terrorism operation in Argenteuil, north-west of Paris, following the arrest hours earlier of a man suspected of planning an attack.
Interior Minister Bernard Cazeneuve said the suspected militant, a French national, was in an "advanced stage" of a plot, adding that no connection had been made to either the Brussels or the Paris attacks.
However, French media quote police sources as saying the suspect, named as Reda Kriket, was convicted in his absence by a Brussels court last year for recruiting IS members to go to Syria.
He was convicted along with Abdelhamid Abaaoud, considered the main organiser of the Paris attacks and killed in a police raid in Paris days later.
Last November, 130 people died after militants opened fire and detonated bombs in a number of locations in the French capital.
The US Secretary of State John Kerry has meanwhile arrived in Belgium for talks on combating terrorism.
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