A man robbed £290 in cash from a Newmarket bookmakers on Sunday.
A man entered the premises, in Wellington Street, at around 6.50pm and approached the counter where he handed over a bag and demanded that staff fill it with bank notes from the till.
The bag was filled with £290 before the man left the store.
The suspect was described as white, between 5ft 6ins and 5ft 8ins tall, of a slim build, and wearing a blue hooded top, a blue scarf covering the lower half of his face, pale blue jeans, white trainers and holding a blue carrier bag.
Anyone with any information should contact Bury St Edmunds CID on 101 or Crimestoppers anonymously on 0800 555 111.