Police have arrested a 15-year-old boy in Northern Ireland over a cyber attack that may have led to the theft of data from among the 4 million customers of British broadband provider TalkTalk.
The attack, which took place on Wednesday, prompted the company to deny accusations of laxity and say its security was "head and shoulders" above that of its competitors. But it has led to calls for greater regulation of how companies and public bodies manage personal data.
A ransom demand was received by TalkTalk on Friday. Since then, the firm has said the attack was not as serious as first feared and it did not believe those behind it would be able to steal money from its customers.
"A 15-year-old boy was arrested on suspicion of Computer Misuse Act offences," London's Metropolitan Police, whose cyber-crime unit has been investigating the attack, said on Monday.