A robber believed to be armed with a gun stole a woman's mobile telephone in Bicester this morning.
The victim, in her 40s, was walking to work along Middleton Stoney Road at 6.30am when the robber pounced.
She handed over her Samsung phone and he ran off towards the Kings End area.
Police said he was believed to be carrying a small black handgun. Sgt Paul Crook said: "We immediately dispatched armed response vehicles and did an area search but found no trace of this man."
The man is white, 16 to 20, 5ft 9ins tall with a slim face and piercing blue eyes. He wore a dark hooded jacket and spoke with a Polish or Russian-type accent.
Anyone with information is urged to contact Bicester CID via 0845 8 505 505 or Crimestoppers anonymously on 0800 555111.
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