The 16-year-old arrested in Hagen is said to have planned the possible attack on the synagogue there over a long period of time.
The Düsseldorf Public Prosecutor's Office reported to the state parliament on Tuesday in response to a request from the Greens that this emerged from the previous evaluation of the numerous data carriers that had been confiscated in this context.
Düsseldorf / Hagen - The investigations and the evaluation of the 487 gigabytes of data that had been secured from the young person continue.
A significant number of Islamist videos were discovered, including those with executions and other atrocities.
The minor is in custody on suspicion of preparing a serious act of violence that is dangerous to the state.
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The young Syrian is said to have asked a suspected IS terrorist for information on the construction of the bomb in Telegram chat and received it.
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The police went to the synagogue on a large scale on the Jewish holiday, Yom Kippur, to guard it.
The authorities assumed an Islamist-motivated threat.
No bomb or parts of the bomb were found.
The 16-year-old had denied the intention to attack.
dpa