German police have arrested a teenage asylum seeker suspected of planning a suicide attack in Berlin, Brandenburg state officials say.
The suspect, 17, was arrested in the Uckermark district, Interior Minister Karl-Heinz Schröter 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.
In December, a jihadist killed 12 people with a lorry in Berlin.
That attack on a Christmas market by Anis Amri, a Tunisian, put security services under intense scrutiny because of the way in which the attacker, who was later shot dead by police in Italy, evaded their surveillance and crossed European borders undetected.
Special forces arrested the teenager after police received a tip-off, Brandenburg police tweeted (in German). He had sent a message to his family saying farewell and that he was joining the "jihad", the police said.