A massive ransomware campaign appears to have attacked a number of organisations across Europe.
Screenshots of a well known program that locks computers and demands a payment in Bitcoin have been shared online by parties claiming to be affected.
There have been reports of infections in Spain, Italy, Portugal, Russia and Ukraine.
It is not yet clear whether the attacks are all connected.
One cyber-security researcher tweeted that he had detected 36,000 instances of the ransomware, called WannaCry and variants of that name.
“This is huge,” he said.
The UK’s National Health Service (NHS) was also hit by a ransomware attack and screenshots of the WannaCry program were shared by NHS staff.
It is not yet clear if the attacks are connected.
More to follow