It said a letter left near the scene of the attack on Tuesday claimed it was in retaliation for German military reconnaissance missions against Islamic State in Syria.
The newspaper also said that the letter might be a deliberate attempt by the perpetrators to mislead investigators.
The Federal Public Prosecutor said in a statement it had taken over the investigation and would hold a news conference at 2:00 pm (08:00 a.m. EDT).
تابناک را در شبکه های اجتماعی دنبال کنید
سایت تابناک از انتشار نظرات حاوی توهین و افترا و نوشته شده با حروف لاتین (فینگیلیش) معذور است.