According to a press release by the Openbaar Ministerie (the Public Prosecution Office), a dutch man with the initials SK has been arrested in Spain for the DDoS attacks on Spamhaus.
Brian Krebs reports: "A 35-year-old Dutchman thought to be responsible for launching what's been called 'the largest publicly announced online attack in the history of the Internet' was arrested in Barcelona on Thursday by Spanish authorities. The man, identified by Dutch prosecutors only as 'SK,' was being held after a European warrant was issued for his arrest in connection with a series of massive online attacks last month against Spamhaus, an anti-spam organization."