Two Britons who allegedly held up a Spanish supermarket were arrested after returning to the shop as customers.
Police swooped on expats Daniel Rushton and Matthew Daly, both 25, in the same store two days after the armed robbery.
Two masked thieves threatened staff with a handgun and a metal bar at the store in the upmarket resort of Puerto Banus on the Costa del Sol.
They escaped with cash from the till and electronic goods from the shop.
A member of staff at the OpenCor supermarket was stunned when two British men walked into the shop two days later on February 2.
He claimed he recognised them as the two men who carried out the robbery two days previously and called police.
Armed officers arrived at the shop within minutes and the men were arrested as they waited in a queue to get credit on their mobile phones.
Detectives who searched the pair's home found two balaclavas allegedly worn by the robbers during the hold up.
A police source said: 'The member of staff couldn't believe it when the two men walked in.
'They were apparently recognised by their build and their eyes underneath the balaclavas.
'It beats us why a robber would return to the scene of the crime so soon afterward.'
The two men appeared in court in Marbella and are being investigated on suspicion of
involvement in several other armed robberies on the Costa del Sol.
They were questioned by an investigating judge, who will rule on whether they should stand trial.
Neither man has been charged.