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The man in his 20's has been arrested on suspicion of conspiring to commit offences under the Computer Misuse Act 1990. Another man has been arrested in Wiltshire.
They are currently in Police custody in South Yorkshire and London respectively.
Scotland Yard said the arrests yesterday were part of a continuing investigation alongside the FBI, South Yorkshire Police and other law enforcement bodies, into the activities of Anonymous and LulzSec, especially in connection with suspected offences under the cover of online identity ``Kayla''.
Detective Inspector Mark Raymond from the Metropolitan Police's Central e-Crime Unit (PCeU), said: ``The arrests relate to our inquiries into a series of serious computer intrusions and online denial-of-service attacks recently suffered by a number of multi-national companies, public institutions and government and law enforcement agencies in Great Britain and the United States.
``We are working to detect and bring before the courts those responsible for these offences, to disrupt such groups, and to deter others thinking of participating in this type of criminal activity.''