Salah Abdeslam, a prime suspect in the Paris attacks, had documents about the German nuclear research centre, Juelich.
He kept them in his apartment, in the Molenbeek area of Brussels, German newspapers have reported.
Juelich is near the Belgian border and atomic waste is stored there. The centre said in a statement there was no indication of any danger and that it was in contact with security authorities and nuclear supervisors.
The Redaktionsnetzwerk Deutschland (RND) news group cited sources within the parliamentary control committee, whose meetings are confidential.
The sources said that Hans-Georg Maassen, head of Germany’s domestic intelligence agency (BfV), had told the nine-person committee, at the end of March, that Abdeslam had the documents.
Mr Maassen also told the committee, which is in charge of monitoring the work of German intelligence agencies, that printouts of articles from the internet and photos of Juelich chairman Wolfgang Marquardt had been found in Abdeslam’s apartment.
RND said it was unclear whether Mr Maassen had passed this information on to the chancellery or the interior ministry.
It said several members of the Bundestag lower house of parliament, and a terrorism expert at the BfV, said they knew of this information.
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