From the Metropolitan Police Dept. web site:
Officers from the Metropolitan Police Central e-Crime Unit (PCeU) have arrested a 19-year-old man in a pre-planned intelligence-led operation.
The arrest follows an investigation into network intrusions and Distributed Denial of Service (DDoS) attacks against a number of international business and intelligence agencies by what is believed to be the same hacking group.
The teenager was arrested on suspicion of Computer Misuse Act, and Fraud Act offences and was taken to a central London police station, where he currently remains in custody for questioning.
Searches at a residential address in Wickford, Essex, following the arrest last night have led to the examination of a significant amount of material. These forensic examinations remain ongoing.
The PCeU was assisted by officers from Essex Police and have been working in co-operation with the FBI.
At the time of this posting, there is no confirmation from the police as to whether the suspect is thought to be associated with Anonymous, LulzSec, or some other group.