The man, named as Abdoullah C, a 30-year-old Belgian national, was arrested on Tuesday. Prosecutors did not announce his arrest then in order to avoid alerting potential accomplices, a spokesman said.
Ninth person arrested in Belgium over Paris attacks
Brussels police have arrested a man in connection with the Nov. 13 militant attacks in Paris which killed 130 people, federal prosecutors said on Thursday, bringing the total number of arrests in Belgium to nine.
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"This person is suspected to have had contact several times with cousin, in the period between the terrorist attacks and the events in Saint-Denis," the prosecutor said in a statement.
An investigating magistrate ordered the man to be detained on suspicion of terrorist murders and participation in a terrorist organisation, the prosecutor's statement added.
Boulahcen and Abaaoud were both killed in a police raid in Saint-Denis, France, days after the Paris attacks.
On Monday police held five people in several searches in Brussels, but all were released later that day.
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