Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: A Venezuelan vet wanted in the USA accused of surgically implanting bags of heroin inside puppies has been arrested by Spanish police Andres Lopez Elorza, 33, was arrested on Saturday for allegedly being part of a drug-trafficking gang that used dogs to send liquid heroin from Colombia to the United State. When police raided his clinic in Medellin, Colombia in 2005, they discovered ten dogs, three of them with three kilograms of heroin implanted inside them. The married father-of-two fled to Spain, where he has been living for the past eight years and working as a vet for two companies.Andres Lopez Elorza arrested after he went into hiding in northern SpainHe is alleged to have been part of a gang using puppies to smuggle heroinVet was cutting open the dogs to surgically implant bags of liquid heroinThe 33-year-old father of two worked as a vet in Spain for two businesses 
 Question:Lopez was arrested in _ in 2013 but released while his extradition was being considered.

Spain