The suspect, a Vienna-based accredited Iranian diplomat whom opposition groups have named as Assadollah Assadi, 46, was one of several suspects detained in Germany, Belgium and France.
They had allegedly planned to bomb the rally by an exiled Iranian opposition group in Villepinte near Paris that was attended by several US politicians.
German prosecutors said Wednesday that a court had two days earlier remanded Assadi in custody on charges of foreign intelligence activities and conspiracy to murder.
They added that these charges did "not preclude" Assadi's extradition requested by Belgium.
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