A man had a knife held to his neck during an armed robbery at a shop in Greater Manchester.
Two men burst into the store on Bowness Road, Middleton, and threatened the assistant with a 6in (15cm) knife, ordering him to open the till.
Police said the men made off with cash and 45 packets of cigarettes after being disturbed by two customers.
Det Con Chris Chivers said the robbers, who both had scarves covering their faces, were "desperate individuals".
The first man was described as black, about 17 years old and was dressed in dark clothing. The other was white and of a similar age.
"It was a cowardly threat to a defenceless shop assistant, who had no idea whether they were going to use the knife or not," added the detective.
"It is vital we catch these men before they strike again and so the victim can see that some justice after his ordeal has been done.
"The robbery happened while it was still daylight and I would appeal to anyone who witnessed these men going into or running out of the store to come forward."