More than four months after a knife attack in Bavaria, the Attorney General in Karlsruhe took over the investigation.
A 27-year-old Syrian had injured four men, some seriously, on an ICE train between Regensburg and Nuremberg on November 6th.
The investigators now assume that it was an Islamist-extremist act.
The Federal Public Prosecutor's Office can take on proceedings relating to state security offenses of particular importance.
Marlene Grunert
Editor in Politics.
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The man, who entered Germany in 2014 and was recognized as a refugee in 2016, was arrested immediately after the attack.
He is in custody.
The investigators accuse him of attempted murder and dangerous bodily harm, among other things.
After the attack, propaganda videos and calls for assassination attempts by the terrorist organization "Islamic State" were found on him;
whether an extremist motive was decisive for the attack seemed unclear.
The investigation was initially carried out by the Munich Public Prosecutor's Office.
As has now become known, the federal prosecutor's office took over in mid-March.
In the meantime, there are not only "clear indications" of the accused's radical Islamist attitude, as a spokesman for the authority announced on Monday.
This also applies to a corresponding motive for the crime.
The accused was apparently not organizationally involved in the terrorist group.
He was probably not controlled by her either.