It looks like the online credit card fraud criminals were miffed at the UK's Serious Organised Crime Agency (Soca) for closing 36 websites believed to be selling stolen credit card information.
Soca confirmed to the BBC that soca.gov.uk had suffered a DDoS attack yesterday but said it did not "pose a security risk to the organisation". Soca's website contains only publicly available information and does not provide access to operational material.
Soca would not confirm if it knew the source or motive of the attack but the fact it seems to have been taking on a lot more web crime lately would hint at a motive. Last month, Soca shut down websites associated with selling stolen financial information. Soca said 2.5 million items of compromised data was recovered, preventing an estimated potential fraud of £500m.