A second arrest has been made in connection with the TalkTalk hack.
Detectives from the Metropolitan Police Cyber Crime Unit made the arrest after searching an address in Feltham.
A 16-year-old boy has been arrested on suspicion of Computer Misuse Act offences and has been bailed.
A second residential address has also been searched in Liverpool.
The developments follow the arrest on Monday of a 15-year-old boy from County Antrim, Northern Ireland; the boy has also been released on bail.
The arrests follow data theft from TalkTalk, which may have seen bank details and personal information of its 4 million customers accessed.
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