The Spanish Ministry of Interior, the UK's Crimestoppers and the UK National Crime Agency (NCA) on Thursday released 13 new photographs of criminals thought to be evading capture in Spain.
The list of suspects includes the suspected leader of a cocaine smuggling ring which imported more than 400kg of drugs hidden in a shipment of frozen Argentinean beef.
There are also figures wanted for armed robbery, attempted homicide and sex offences against minors.
It's all part of the long-running Operation Captura, designed to bring justice to UK fugitives in Spain.
Fifty three of the 63 people wanted under the original Operation Captura objectives have been arrested and brought to justice since the campaign kicked off in 2006.
Now authorities have their sights on a further 13 suspects and want the help of expats.
"Despite our success so far, there are still a number of dangerous criminals who see Spain as a safe haven to hide from their past," said Lord Ashcroft, Founder and Chair of Crimestoppers.
"But with the support of the Spanish and UK public, we can hunt them out and bring them to justice."
People with information calling from Spain can use a special freephone Spanish 900 555 111 telephone number which will be answered in the UK by Crimestoppers’ call agents and a translation service is available upon request.
People can also pass on information anonymously via the Crimestoppers number 0800 555 111 or online at www.crimestoppers-uk.org.