Sentence:  A second group of security men had appeared from within the museum, and lashed out with their clubs like warriors in a battle scene from a Kurasawa epic. […] ‘It's another <WSD>ratissage</WSD>. A special action.' 
Meaning of the word marked with <WSD> tags:  A raid (especially violent) carried out by the police or military, originally and chiefly carried out by the French in Algeria. (from 1950s)