The speaker of the House of Commons has ordered political parties to end "dirty tricks" campaigns being fought over the Internet between political rivals.
The warning from Speaker Michael Martin came after an MP claimed that he had been the victim of "cyber impersonation".
Bob Russell, the Liberal Democrat MP for Colchester, claimed that a Web site had been set up in his name by a "leading member" of a rival political party in his constituency.
Web users searching for Russell's own Web site were taken directly to the Conservative's own Web site, said Russell.
The speaker urged all MPs to take measures to ensure that similar Web spoofing was not undertaken on their behalf.