The Long Day of Inspector Blomfield

The Long Day of Inspector Blomfield is a 1968 German crime film directed by Rudolf Zehetgruber and starring Götz George, Werner Pochath and Anthony Steel. It was one of a number of movies Steel made in Europe while based in Rome.

Premise
A drug addicted man takes over a British police station, holding it hostage with a bottle of nitroglycerine. He demands to see Inspector Blomfeld, but the Inspector is away dealing with another case.