Parliament's computer system has been struck by the deadly Conflicker virus, it has been revealed.
Conficker targets a flaw in Windows Server and despite Microsoft releasing an emergency patch and urging all web users to download it, many machines remain unprotected. Once the machines have been infected with the worm, they become slaves.. It is thought that on April Fool's Day, the worm's creator will take control of the infected machines.
"It's set to go off April 1, 2009 and Conficker will generate 50,000 URLS daily," said Computer Associates director of threat research, Don DeBolt.
Some security researchers have speculated the attack will in some way affect the G20 summit being held in London the following day.
According to Channel 4 news, PCs belonging to MPs, members of the House of Lords and their staff have all been infected with the virus.
Channel 4 also said it was likely that the PCs were unsecured. However, a House of Lords spokesman refused to comment on when anti-virus software on the machines had last been updated.