A man in Bletchley walked around the area threatening shop workers with a screwdriver before stealing cash from the tills.
At around 5pm on September 10 the man stole Peak Pharmacy, Melrose and on the same day at 8pm the suspect took money from Paddy Power, Queensway.
An hour later the suspect he then attempted to get into Ladbrokes, Queensway but the door was locked.
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Thames Valley Police described him as a white man, around 25 to 35 years old with dark hair and a slim build.
The man was wearing a black coat with grey jogging bottoms, a blue surgical mask and black ski glasses.
Investigating officer Detective Constable Sebastian Kuzoe, based at Milton Keynes police station, said: “I am appealing to anyone who witnessed or knows anything about these incidents to please come forward.
“Anyone with information can contact police by making a report online or calling 101.
“Alternatively, if you wish to remain anonymous, you can contact the independent charity Crimestoppers on 0800 555 111 or via their website.”
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