Hackers who have hit the websites of the CIA, US Senate, Sony and others during a month-long rampage claim to have knocked the site of Britain's Serious Organised Crime Agency (SOCA) offline.
"Tango down - soca.gov.uk - in the name of
AntiSec," the hacker group known as Lulz Security said in a message on their Twitter feed @lulzsec.
"Tango down" refers to the elimination of an enemy while "AntiSec" refers to "Operation Anti-Security," a campaign launched by Lulz Security against government websites.
Computer security firm Sophos said the SOCA website was sporadically inaccessible following the Lulz Security attack.
Sophos said it appeared to be a distributed denial of service attack in which a website is overwhelmed with traffic and becomes sluggish or unresponsive.
Lulz knocked the CIA's public website, cia.gov, out of commission for about two hours last week using a DDoS attack and also hacked into the US Senate's public website.
The group has also released tens of thousands of user names and passwords stolen from Sony and other sites.