Police have released a CCTV appeal after two men armed with an axe robbed the same Morrisons store three times.
The robberies happened at the Morrisons Daily shop on Albert Royds Street in Rochdale between November 13 and 23, police said.
During the first, two men burst into the shop at around 6.40pm and demanded staff empty a till of money.
One of the men was wielding an axe.
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The suspects fled the scene with cash from the till in the direction of Halifax Road.
In the second robbery, at around 7.50pm on November 17, a masked, hooded man armed with an axe again demanded money from the till.

He fled the scene with cash in the direction of Samson Street.
The final robbery occurred a few days later on November 23 at around 7.05pm.
A man, again armed with an axe, burst into the same shop and demanded money from the till.
No-one was injured in the incidents, police said.
Officers believe the robberies are linked.
They have now issued pictures of two men they want to talk to in connection with them.
If you recognise these men or have information that could assist our enquiries please contact police on 0161 856 4668 or via our LiveChat at www.gmp.police.uk quoting 2722 of 13/11/21.
Alternatively, details can be passed via the independent charity Crimestoppers on 0800 555 111.