Police believe these men may have vital information.
Detectives have appealed for help as part of an investigation into two thefts from shops which took place last month.
The man pictured top right, wearing a white polo shirt, may have information about an incident on Thursday, July 11.
Anyone who recognised him should call 101 and quote reference DA674.
The man pictured bottom right, wearing stripy T-shirt, may be able to help officers investigating a second, unconnected, theft from a shop.
It took place in the city on Monday, July 8.
Anyone with any information should call 101 and quote reference DA671.
Alternatively call Crimestoppers on 0800 555111.