Londonderry: Armed robbery at Elmwood Street business 27 December 2013 Last updated at 12:20 There has been an armed robbery at a business premises in Londonderry. A masked man was reported to have entered the premises on Elmwood Street armed with a knife at around 17:10 GMT on Thursday. A member of staff was threatened during the incident, but was not harmed. It is believed the man made off with a sum of money. He is described as being 5ft 3in tall, of slim build and was wearing a dark green balaclava. He was also wearing a dark-coloured top and dark blue tracksuit bottoms with drops of white paint on them.