Police in Brandenburg state said the teenager was detained Tuesday in the village of Gerswalde, 100 kilometers (60 miles) northeast of Berlin, after they learned he had sent a farewell message to family members and told them that "he had joined the jihad," or holy war.
The WhatsApp message talking about jihad to the suspect's family was sent within the last week and Brandenburg authorities were told of it last night by two other German states, Brandenburg police spokesman Torsten Herbst told The Associated Press.
The federal Interior Ministry said it had no indications that an attack had been imminent.
The state Interior Ministry's office identified the suspect as Syrian, but Herbst said investigators were checking to see whether he falsely registered as a Syrian but was actually from a North African country.
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The teenager, whose name wasn't released, came to Germany in 2015 as an unaccompanied minor and registered as an asylum-seeker. He has been living since 2016 in a home for minor refugees in Gerswalde, and was detained there in the Tuesday morning raid.
The attack, carried out by a young Tunisian man who had been denied asylum in Germany, was claimed by the Islamic State group.
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