Police are appealing for information following a robbery at Vange Riverview Centre, Basildon on Monday December 2.
At around 7.25am a man wearing a zombie mask entered Martins Newsagents and threatened the people in the store with a knife, demanding money and cigarettes.
The man has been described as in his 20s, around 5ft 6in to 5ft 8in tall, of a stocky build and wearing an orange high visibility coat, dark coloured knee length shorts and a blue hoddie.
The man left and walked in the direction towards Whytewaters.
Did you see a man of this description in the area, or anyone wearing or carrying a zombie mask?
Anyone with information or CCTV of the area is asked to call Basildon CID on 101 quoting crime reference number 42/190518/19.
Information can also be given anonymously to independent charity Crimestoppers by calling 0800 555 111 or visiting crimestoppers-uk.org