Some incidents may be linked to North Korean IT workers infiltrating tech firms, according to research firm Chainalysis.

Pat McFadden will tell a Nato conference that Russia could try to attack British businesses and power grids.

Firms are advised to practise operating with pens and paper in case of a computer meltdown.

FBI launches investigation after around 109 million customers had call and text information taken.

The former chief executive of the National Cyber Security Centre says it is a "serious" ransomware attack.

US and EU crime agencies make arrests after suspects used information for fraud and bomb threats.

These include names, addresses, phone numbers, emails and other information.