bloody friday (1972)

aka Blutiger Freitag. Violent Offender.
"We are all going to make a lot of money."
Violent bank robber Heinz Klett (Raimund Harmstorf) escapes from police custody, and immediately starts planning his next bank robbery. But despite his planning the robbery turns into a siege with hostages. Outside, the police attempt to put together the ransom, whilst trying to deal with the media circus. Inside, the tension mounts and squabbles break out...
Violent exploitation fare, that works well with what it has.