Conversation so far:
What was Elrich Mielke's role in the Bülowplatz trial?
Mielke and Erich Ziemer opened fire at point blank range at the Babylon Cinema, on Captain Anlauf, Sergeant Willig, and Captain Franz Lenck.

Question: How many persons were murdered?
Self-contained rewrite: How many persons were murdered in the Bülowplatz murders?