In the case of the alleged attack plan on the synagogue in Hagen, investigators applied for an arrest warrant against a 16-year-old Syrian on Friday.
Accordingly, the Düsseldorf Public Prosecutor's Office dealing with the case sees an urgent suspicion.
According to security circles, the 16-year-old Syrian citizen admitted in an interrogation that he had talked to a chat partner on the Telegram messenger service on the subject of bombing.
The young person is said to have denied having been involved in plans for an attack.
Pure burger
Political correspondent in North Rhine-Westphalia.
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The contact person is said to have been a member of the terrorist organization "Islamic State" (IS) known to the secret services.
Therefore, there were good reasons for the quick access and the immediate securing of the Hagen synagogue with a large police force, it was said from security circles.
The sixteen-year-old's father and two brothers were released on Thursday evening after the police did not find any bomb components when they searched their apartment.
The German security authorities received a very specific message from a foreign secret service on Wednesday that a jihadist-motivated attack on the synagogue in the Westphalian town of Hagen could be threatened on Yom Kippur, the highest Jewish holiday.
The secret service had become aware of the young Syrian's chat behavior.
The young person's lawyer told the German Press Agency on Friday morning that he did not expect an arrest warrant to be issued against his client.
"No charge has been substantiated that would justify that," said Ihsan Tanyolu.
The defense attorney did not want to comment on the statements made by his client during his interrogation.