Thieves wielding sledgehammers targeted a Wigan shop.
The incident happened at the McColls convenience store in Hindley near the junction of Atherton Road and Palin Street on November 19.
Police say three men holding sledgehammers and a wooden fence post entered the store at around 6am.
They threatened staff and demanded they open the safe and tills.
No one was injured during the robbery but staff members were left "shaken," GMP said.
The offenders, described as three white men who were all wearing dark clothing, fled in a white van with cash and cigarettes.
Det Con Sally-Anne Skellern, of GMP's Wigan district, said: "These men were willing to threaten innocent people with weapons, and although no one was injured, the victims were left feeling frightened and understandably upset.
"We are appealing for anyone who may have been in the area at the time and witnessed this incident or have seen anything suspicious to please come forward and speak to police. Even the smallest piece of information could help officers to complete their enquiries."
Anyone who has any information about the robbery is asked to call police on 0161 856 7770 quoting incident number 402 of 19/11/20.
Details can also be passed on anonymously to the independent charity Crimestoppers on 0800 555 111.
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