Some time ago I saw a rather old (50s, maybe 60s at most) German (West-German, to be accurate) movie on TV, which I only have rather vague memories about, and which you might help me identify. I don't remember if it was black and white. While some memories tell me it was, other memories are more colorful. It was set in a rather big and famous city, like Berlin or Hamburg (images of the Hamburg warehouse district come to mind).
It was a crime movie about a bank robbery with the robbers taking the bank manager and his family as hostages in order to gain clean access to the bank (a premise similar to the 2001 movie Bandits, so to say). The robbers consisted of 4 members, I think. One of them, the boss, was a quite suave guy in a suit. Another member was a young woman with short blonde hair and a strong Austrian accent, who seemed rather cold-blooded compared to her fragile looks. She was responsible for controlling the bank managers family at home while the manager was heading for the bank together with the boss.
There are some other vague scene snippets I can remember (and I hope I don't mix in other movies here): At one point the robbers try to get hold of some cassette (which they stole from the bank?) and it accidentally drops into the river. In another scene one of the robbers is surrounded by the police in a small cottage (outside of town) and eventually gunned down, I think (or just arrested?). I remember that the movie's style and story-telling was very factual and objective, yet exciting for me.