Asos users were sent pop-up messages from its app that appear to have been sent by hackers trying to extort the company. Hackers seeking to pile pressure on potential victims by informing their customers is not common and marks a significant moment in cyber-attack history. The BBC’s Cyber Correspondent explains why an attack like this is so rare. Tap the link in @BBCNews's bio to find out more about the attack. #Asos #Hacker #BBCNews