Detectives are appealing for information after a man held-up a service station at gunpoint.
The offender walked into the Robin Hood Service Station, in March, wearing a balaclava at 7.35pm on New Year's Eve.
He pointed a handgun at two members of staff and demanded they open the till and the safe. He then took cash before making off.
The offender is described as white, in his late 20s, muscular and being 6ft 2ins tall. He was carrying a black and grey rucksack.
Police want to speak to a regular customer who entered the store shortly after the offender had left as he may have vital information to assist the investigation.
Det Con Mark Yendley, investigating, said: 'This was a terrifying experience for the members of staff who were threatened.
'I would appeal to anyone who saw this man before or after the incident to contact police.
'In particular we would like to trace the customer who came into the store a few minutes after the robbery.
'He was told he could not be served because of what had just happened but may have seen the offender making off.'
Anyone with any information should call Norfolk Police 0345 456 456 4 or Crimestoppers, anonymously, on 0800 555111.
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