Detectives investigating three robberies at the same shop in York still require witnesses to help with their enquiries.
Earlier in the week a 14-year-old youth was arrested and charged with the latest robbery at the Goldmine Convenience Store on Haxby Road at around 6.30pm on Sunday 13 May.
Officers are still actively seeking a second person they believe was involved in the incident and are appealing to anyone with information to come forward.
Inspector Ian Dyer, of York CID, said: "Although we have arrested and charged someone with the latest robbery at the Goldmine store, the investigation is still very much ongoing.
"We know a further person was involved and officers are making extensive enquires to trace him.
"I am urging anyone who can help with our enquiries to contact the police with information, or if you wish to remain anonymous please call Crimestoppers."
Investigations are also ongoing into a robbery at the same store at around 11.15pm on Tuesday 8 May 2012.
Two men entered the shop and threatened the woman behind the counter with a large knife before grabbing notes from the till and running off.
The first man is described as 6ft tall with a stocky build. He was wearing light grey jogging bottoms and a dark Reebok hooded top, with a scarf covering his face.
The second man is also approximately 6ft tall. He was wearing a grey hoodie with a pattern on the front, dark tracksuit bottoms and dark trainers. His face was covered by a Halloween mask and he was carrying a black shoulder bag with a long strap over his back.
Officers would like to speak to anyone who witnessed the incident to contact them with information.
A further robbery was committed at the Goldmine store at around 10pm on Sunday 12 February 2012.
The shop assistant was threatened with a hammer before the offenders fled with the takings.
A 33-year-old man has been arrested in connection with this incident, however officers still need witnesses to come forward to help the investigation.
Inspector Dyer added: "The other two robberies are also still subject to ongoing enquiries and it is vital that anyone who saw anything suspicious on the dates in question or has any information that can help the investigation gets in touch with the police or Crimestoppers as soon as possible."
Anyone who can help officers with their enquiries is urged to contact North Yorkshire Police on 101 - select option 2 - and ask for York CID.
Alternatively, Crimestoppers can be contacted anonymously on 0800 555 111.
4.46pm - 23 May 2012