Infamous hacking group LulzSec may have sealed its fate after logging into its website using a router based in Britain, where alleged member Ryan Cleary would later be arrested.
The group signed up for a free account with CloudFlare, a service that optimises the speed of websites and mitigates attacks levelled against them.
The sign-up occurred within hours of a hack of US news service PBS, where LulzSec posted a fake story.
During its 25 day tenure with CloudFlare, a lone British IP address was recorded logging into lulzsecurity.com.
The IP address stood out because other log-ons were made through virtual private networks routed through other countries.
Authorities were further assisted because the username registered with the site was the same as that used in a chat room they monitored.
CloudFlare CEO Matthew Prince told the RSA conference last week that his firm "made lots of friends with some three-letter [law] agencies" while it mitigated attacks against lulzsecurity.com.