A lawyer representing former Catalan leader Carles Puigdemont says he's being held by German police.
Jaume Alonso-Cuevillas says Mr Puigdemont is at a police station after arriving from Denmark.
A Spanish Supreme Court judge reactivated an international arrest warrant for Mr Puigdemont on Friday while he was visiting Finland.
Warrants have also been issued for five other Catalan separatists.