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An 18-year-old man has been arrested on suspicion of blackmail over the TalkTalk hack.
Personal details of thousands of customers were accessed in the cyber attack at the end of last month.
It is the fifth arrest in a Met Police investigation into alleged data theft from the communications company.
Police said the teenager was detained at an address in Llanelli, Wales and remains in custody.
A 15-year-old boy from County Antrim, two 16-year-old boys from Feltham and Norwich and a 20-year-old man from Staffordshire have also been arrested over the hack.
All were questioned on suspicion of Computer Misuse Act offences and were released on bail.
A 16-year-old boy has become the fourth person arrested in connection with the cyber attack on telecoms company TalkTalk.
The teenager was arrested in Norwich on Tuesday evening, Scotland Yard said.
He remained in custody at a local police station as searches continued at the property where he was detained.
A 20-year-old man from Staffordshire, a 16-year-old boy from London and a 15-year-old boy County Antrim in Northern Ireland have also been arrested in connection with the incident.
A Metropolitan Police spokesman said: "On the evening of Tuesday, 3 November, detectives from the Metropolitan Police Cyber Crime Unit and officers from the National Crime Agency executed a search warrant at an address in Norwich.
"A 16-year-old boy was arrested at the address on suspicion of Computer Misuse Act offences. He currently remains in custody at a local police station."
A 20-year-old man from Staffordshire is the third person to be arrested in connection with alleged data theft from TalkTalk, the Metropolitan Police have said.
He is being held on suspicion of offences under the Computer Misuse Act and remains in custody at a local police station.
North Antrim MP Ian Paisley has appealed to the press on behalf of the family of a 15-year-old boy allegedly involved in the TalkTalk hacking case to respect their request for privacy.
Police say a 15-year-old boy arrested in County Antrim, Northern Ireland, yesterday as part of the investigation into the alleged cyber attack on TalkTalk has been released on bail pending further enquiries.
TalkTalk says it will not waive termination fees for customers wanting to end their contracts unless money has been stolen from them.
In a statement on its website, the said it would only consider a request to leave without a termination fee if a customer:
- Money had been talk from their account without consent and as a result incurred a financial loss
- The money was taken on or after the 21 October 2015.
- The customer has contacted Action Fraud and obtained a Crime Reference Number.
A 15-year-old boy in Northern Ireland has been arrested in connection with the TalkTalk security breach.
The Metropolitan Police said the boy, from County Antrim, was arrested at around 4:20pm today by officers from the Police Service of Northern Ireland (PSNI) on suspicion of Computer Misuse Act offences.
Latest ITV News reports
As TalkTalk finally confirms the real extent of its data breach, it's time for the company to be more open with customers.
Around 21,000 unique bank account numbers and sort codes were accessed in the TalkTalk cyber attack, the firm said on Friday.