"The suspect was found with his computer systems open and logged on to various virtual systems and forums," says the police document shown to the London Evening Standard. "The subject has a significant amount of money flowing through his bank account. Financial investigators are in the process of restraining monies."
The young miscreant was arrested in April at the same time as a 35 year-old Dutchman (thought to be Sven Kamphuis – the owner of hosting firm Cyberbunker) as part of an investigation into the Spamhaus attack by British police dubbed Operation Rashlike. The arrest was kept secret, and the boy has been released on bail pend a trial later in the year.
The police document states that the Spamhaus attack in March was the "largest DDoS attack ever seen," and claims the performance of the London Internet Exchange was hard hit. The attack caused "worldwide disruption of the functionality" of the internet, it states.
Certainly the attack was a biggie. On March 18, Spamhaus and its networking partner CloudFlare started getting DDoSed at around 90Gbps. When that failed to take the site offline, the attackers went upstream to ISPs and internet exchanges in Amsterdam and London (even El Reg's own Trevor Potts inadvertently took part), and by March 22 over 300Gbps was hitting the Spamhaus servers.