The teenager arrested in connection with the TalkTalk hacking has been released on bail, the PSNI said today.
The 15-year-old boy who was arrested in Co Antrim on Monday was released pending further inquiries.
Police said that the investigation being conducted by the Metropolitan Police cyber crime Unit, the PSNI and the British National Crime Agency was continuing.
The teenager was detained by officers from the Police Service of Northern Ireland on suspicion of Computer Misuse Act offences.
The boy is understood to be from the Ballymena area of north Antrim. His arrest was part of a joint operation between officers in Northern Ireland and Britain, also including National Crime Agency staff.
The Met cybercrime unit is leading the investigation into the major security breach of the telecoms company, which has four million customers.
It emerged last week that the personal information of an unknown number of customers could have been compromised during a major cyberattack on its website.
Worrying time
A statement issued by the Met on behalf of TalkTalk acknowledged it was a “worrying time” for customers following the data breach in which customer names, addresses and partial bank account details were allegedly stolen.
“We know this has been a worrying time for customers and we are grateful for the swift response and hard work of the police. We will continue to assist with the ongoing investigation,” it said.
North Antrim MP Ian Paisley, who received a briefing on Monday from police in relation to the security breach, welcomed the boy's arrest.
He said the security breach had concerned people across the UK and he would be seeking updates as the investigation progresses.
“The type of attack suffered by TalkTalk once again highlights the significant danger that cybercrime poses and the impact that it can have on the community,” he added.
“Virtually every household will have banking or other personal information stored by companies on computer systems and should those systems be compromised it can leave people vulnerable to a range of crimes.”
TalkTalk said company executives are to be called to appear before MPs to explain how hackers were able to steal customer details.
