Yahoo hack could be biggest cyber-breach in history
Millions of users advised to change their passwords
Yahoo believes "state-sponsored" hackers stole data on some 500 million users in what could be the largest publicly disclosed cyber-breach in history.
The hack took place in 2014 but has only now been made public. In the UK it is believed data on approximately eight million user accounts was taken.
Stolen data includes names, email addresses, telephone numbers, dates of birth and encrypted passwords, but not credit card data, according to Yahoo.
The technology giant said the information was "stolen by what we believe is a state-sponsored actor" but did not say which country it held responsible.
The FBI has confirmed it is investigating the claims.
According to a BBC report, news of a possible major attack emerged in August when a hacker known as "Peace" was apparently attempting to sell information on 200 million Yahoo accounts.
On Thursday, Yahoo confirmed the breach was far bigger than first thought. In the UK, ISPs (Internet Service Providers) Sky and BT issued warnings for customers that they may be affected by the breach as Yahoo provides email services for both ISPs.
Yahoo is recommending all users should change their passwords, especially if they have not done so since 2014.
To read the BBC report in full visit: http://www.bbc.co.uk/news/world-us-canada-37447016k/news/world-us-canada-37447016