Final answer:
The correct word to fill in the blank is 'alleged', which means the police have accused or suspected the men of committing the robberies but it has not been proven yet.
Step-by-step explanation:
In this context, the correct word to fill in the blank is alleged. The word 'alleged' means that the police have accused or suspected the men of committing the robberies, but it has not been proven in a court of law. It suggests that the men are the likely culprits, but the evidence is not yet conclusive.