"The Prosecutor General's Office today detained a 31-year-old Russian citizen, named Magomed-Ali S., on the basis of an arrest warrant dated August 9, 2018. The operation was conducted by a special unit of the federal criminal police and the Berlin criminal police. In addition, the suspect's apartment was searched," the German officials stated.
The release said the detainee "is suspected of preparing a serious crime against the state and preparing a crime with the use of explosives." According to the Prosecutor General's Office, he was suspected of working with Clement B., who was detained in France in 2017.
"The suspect, who is a radical Islamist, together with a man in France, suspect Clement B., wanted to produce explosives. They were to be put into action in Germany at an unknown time in an unknown place to kill and injure as many people as possible," investigators say.
The attack was foiled in 2016 due to investigative measures by law enforcement agencies.
Later in the day, the Russian Embassy in Germany said that it was looking into the arrest of a Russian citizen in Berlin.
"The Russian Embassy is checking the information on detention of a 31-year-old man in Berlin on suspicions of plotting a terror attack. In particular, we are clarifying in cooperation with the German authorities if the detainee has Russian citizenship," the embassy's press service said.
The authorities of Russia's Chechen Republic, where the suspect reportedly came from, pledged to monitor the situation with the man detained in Berlin.
"Millions of people are named Magomed-Ali, where does the confidence that the man is a Chechen comes from? Good if there is proof… This person, if it is proved that he has been planning a mass murder of innocent people, must be brought to justice," Chechen Minister of National Policy, External Relations, Press and Information Dzhambulat Umarov told Sputnik.
According to Frauke Koehler, the spokeswoman for the German prosecutors, the suspect regularly visited a now-defunct mosque in Berlin, as well as Clement B. and Anis Amri, who carried out truck ramming attack in Berlin in 2016, killing 12 people and injuring 56.
"It is possible that Magomed-Ali and Anis Amri met each other there," Koehler, whose speech was aired by the N-TV broadcaster, stated.
In 2017 the French police found guns, explosives and the flag of the Daesh* terror group in the apartment of suspect Clement B., arrested just a few days before the presidential elections in the country.
*Daesh (also known as IS, ISIL, ISIS, Islamic State), is a terrorist group banned in Russia