The United States has indicted four individuals, including two Russian intelligence officers, for the 2014 hack of 500 million Yahoo accounts.

Yahoo Inc has revealed the security of at least 500 million user accounts may have been breached at the end of 2014.

A group of Russian hackers calling themselves ‘Fancy Bears’ on Tuesday leaked confidential medical files of some US athletes, including four time Olympic gold medal winning gymnast Simone Biles and tennis superstar sisters Serena and Venus Williams.