The first suspect is described as white, aged in his 20s, 5' 8", of athletic build and was wearing a khaki coloured anorak, grey or blue jeans and white sports shoes. He had a grey woollen scarf over the lower half of his face and a distinctive blue hood over his head.
The second suspect is white 5' 8" to 5' 10", of average build with black hair and wearing similar clothes to the first suspect. Call 101 or email firstname.lastname@example.org quoting Operation Garner or alternatively ring the independent charity Crimestoppers on 0800 555111.
The photos show the suspects threatening the staff. We are keen to hear from anyone who may have seen these men in the area or have any information to assist the investigation.
More top news
Philippa has the latest weather update for the east
Philippa has the latest weather update for the west
A tarot card reader has been describing how a murderer confessed during a reading she was giving.