Because he is said to have robbed a bank in Filderstadt (Esslingen district), a 63-year-old man came into custody.
He is accused of attempted blackmail, as the prosecutor and police announced on Wednesday.
Filderstadt - The convicted man was arrested on Tuesday after the attack.
He is said to have indicated to three bank employees that he had a weapon with him.
He also threatened her with an "object suspected of being firearms".
The item later turned out to be harmless.
A speaker did not want to say what kind of object it was.
Likewise, a suspicious suitcase turned out to be harmless.
After the police surrounded the building, the man stepped in front of the bank and allowed himself to be arrested without resistance.
dpa