This brings the number of people detained in Belgium to eight.
Attackers armed with automatic rifles and suicide belts killed 130 people at a number of sites in Paris. Some of the attackers had lived in Belgium.
Belgian prosecutors said a 20-year-old Frenchman, listed as Samir Z, had been stopped at Zaventem airport, north-west of Brussels, preparing to board a flight to Morocco in the early hours of Sunday.
They said he was "considered to be part of the entourage of Bilal Hadfi".
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