A Russian group has hacked 1.2 billion usernames and passwords belonging to more than 500 million email addresses, according to Hold Security – a US firm specialising in discovering breaches.

Hold Security described the hack as the "largest data breach known to date".

It claimed the stolen information came from more than 420,000 websites, including "many leaders in virtually all industries across the world".

via BBC News – Russia gang hacks 1.2 billion usernames and passwords.