Near the top of the article it says that he was arrested for kidnapping.
I assumed that he was arrested and would be extradited, but this article says that he will have a bond hearing on Wednesday of this week, and that his arraignment will be held on May 20. So I assume that he is facing charges in the U.S. and this is not in relation to extradition to Spain (although that could be forthcoming later). But if the kidnapping happened in Spain, why is he facing charges here and having a bond hearing here and an arraignment here? I would have thought that he would be facing an extradition charge to Spain in relation to a kidnapping charge.
I suppose it will become more clear as the week continues, certainly at his bond hearing on Wednesday.