German police have arrested a teenage asylum seeker suspected of planning a suicide attack in Berlin, the BBC quoted Brandenburg state officials as saying on ?Tuesday.
The suspect, 17, was arrested in the Uckermark district, Interior Minister Karl-Heinz Schroter announced.
But Brandenburg police say they have not confirmed reports that the teen, who entered Germany in 2015, is Syrian and was definitely planning an attack.
Special forces arrested the teenager after police received a tip-off, Brandenburg police tweeted. He had sent a message to his family saying farewell and that he was joining the "jihad", the police said.
The message was sent via WhatsApp in the past week and Brandenburg authorities received the tip-off late on Monday from two other German states, a police spokesman told said.
The Brandenburg interior ministry said the suspect was Syrian but police tweeted that neither the "Syrian nationality" nor "concrete attack plans" could yet be confirmed, and that investigations continued.
Investigators are looking into whether the suspect may have falsely registered as a Syrian, police spokesman Torsten Herbst said.
The suspect had been living in a home for unaccompanied underage refugees in Uckermark, north-east of Berlin, since 2016 and had never before come to the attention of police.
He is currently being questioned and the home is being searched by the state criminal investigation office, Brandenburg police said.
Some 280,000 asylum seekers arrived in Germany last year, a drop of more than 600,000 compared to 2015.