premise: The police report that they have obtained CCTV images of a robbery that took place at a mini-supermarket in a suburb of Littleton. The recordings show that three masked men entered the store in North Road as the duty manager Debra Mooney and her assistants were preparing to close down at about 23.50 BST on Friday 20 April. The following facts are also known: Two of the men jumped over the counter and grabbed a quantity of cash from the tills. The other man threatened the staff with what appeared to be a kitchen knife. None of the staff was injured in the incident but they were badly shaken by the experience. Bret Desmond, the brother of one of the assistants, was recently released from prison after serving a sentence for robbery. The owner of a nearby hardware store had reported to the police that a set of kitchen knives had been stolen from his shop on the afternoon of Friday 20 April.
hypothesis: The duty manager Debra Mooney and her assistants were subjected to physical violence during the course of the incident.