Teenager, 15, arrested over bank robbery The man, carrying what is believed to be a firearm, demanded cash from the cashiers before fleeing on foot with an undisclosed quantity of cash. A smokescreen security device was activated during the incident. A woman working in the adjacent shop said: "We did not know it had even happened. Customers were coming in and telling us, that is when I saw the smoke. It is terrible really. Detective Sergeant Phil Atkinson of Merseyside Police said: "Enquiries are on-going in relation to this robbery - CCTV is being examined and witnesses being spoke to. This must have been very frightening for the staff members involved and I am sure the community would agree that the person responsible needs to be brought to justice. I would appeal to anyone who was in the area at the time, who might have witnessed this incident to get in contact. Any information, no matter how small could assist with our investigation.