A 29-year-old French man with a European warrant issued for his arrest has been held by police in Marbella.
The man, originally from the French city of Nantes, is alleged to have kidnapped and tortured a man, under a contract from a third party, with three accomplices in December.
The victim was burnt and had a finger amputated. The attack is said to be related to drugs.
The wanted man was found in a property near Marbella. His alleged offence carries a sentence of 30 years in France.