
PHOTO: REUTERS
The federal prosecutor's office did not confirm the arrest.
Six people arrested in Brussels after attacks
De Standaard newspaper said the man, whom it did not name, was arrested after a policeman recognised him from the security footage.
Khalid El Bakraoui, 27, who blew himself up on a crowded rush hour train, is the brother of Brahim El Bakraoui, who detonated a bomb at Brussels Airport an hour earlier.
Belgium names Brussels bomber brothers
The joint attacks killed at least 31 people and wounded 316.
Public broadcaster RTBF meanwhile reported police detained a seventh person in the district of Forest following six arrests late on Thursday.
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