A reward of up to £10,000 has been offered for information which could help convict a knifeman who robbed a Brighton betting shop.
Sussex Police said the hooded man was handed £130 after he demanded money from the staff at Ladbrokes betting shop in Arundel Road, Kemp Town.
He walked out of the shop to the junction with Eastern Road, where he met two other men in dark clothing.
No one was assaulted or injured in the robbery on the evening of 5 November.
The suspect is described as white, with Liverpool accent, between 5ft 6in and 5ft 10in tall, of slim build and wearing a dark coat and a scarf round his face.
"Someone out there must know who committed this robbery, or who the two men the offender met with shortly afterwards are," said Det Con Jane Walker.
"I would ask anyone with information to contact Sussex Police."