BT customers are being targeted by scam emails in the wake of the WannaCry ransomware attack.

The fraudulent emails warn customers that BT is updating its systems to protect its customers from such attacks. It asks them to confirm a security upgrade that gives it "temporarily limited access to profile features that contain sensitive data".

A classic example of a "phishing" email, the message asks users to provide personal information that a company would never request. BT warns that it will never ask for account information in an email.

"No reputable organisation should ask for personal details via email, so that should always be a giveaway for a phishing email," the company said in a blog.