German police have detained a 32-year-old Iranian citizen suspected of having acquired cyanide and ricin, deadly poisons, to carry out an attack «motivated by Islamists», authorities in western Germany said on Sunday.

The suspect’s residence in the city of Castrop-Rauxel was searched as part of the investigation, according to a joint press release from the Düsseldorf public prosecutor’s office and the police of the cities of Recklinghausen and Muenster.

“The suspect is suspected of preparing a serious act of violence that endangered the state by allegedly obtaining cyanide and ricin to commit an Islamist-motivated attack,” the statement said.

This, police said, carries a prison sentence of between 6 months and 10 years.

Police seized electronic storage devices but found no cyanide or ricin during the search, Holger Heming of the Düsseldorf public prosecutor’s office told Reuters TV.

Castrop-Rauxel is in North Rhine-Westphalia, Germany’s most populous state, whose Interior Minister Herbert Reul said: “We had a serious warning that caused the police to intervene overnight. The authorities are now investigating at full speed.”

Heming said the information came from a «friendly state» security agency, without elaborating. The massive tabloid Bild said the agency in question was the US Federal Bureau of Investigation.

Police said a second individual was detained as part of the searches, adding that a decision on whether to issue an official arrest warrant would be made at a later date while the investigation continues.

Heming confirmed that the person was the suspect’s brother.

Ricin, found naturally in castor beans, can cause death within 36 to 72 hours of exposure to as little as the head of a pin. There is no known antidote.

According to German national intelligence services, the number of members or supporters of Islamist causes has dropped by 1.5% to 28,290 people in 2021, citing the «military breakup» of the Islamic State militant group.

On December 19, 2016, Anis Amri, a failed Tunisian asylum seeker with Islamist ties, drove a truck into a crowded West Berlin Christmas market, killing 11 people and injuring dozens.

The news about Sunday’s raids also comes a month after German authorities arrested 25 members and supporters of a far-right group that prosecutors say was preparing a violent overthrow of the state.