An worldwide manhunt was under way for the plotters behind the world's biggest-ever computer ransom assault which has affected more than 150 countries.
Following on from the news that the NHS and organisations in 150 countries around the world have been affected by a cyber attack, there have been fresh fears that the ransomware virus could spread even further when people return to work on Monday.
The threat is "escalating" as cyber experts warned that another attack was imminent in coming days.
The ransomware attack struck British National Health Service organisations, along with computer networks of companies and municipalities in dozens of other countries.
The full scale of the global cyber attack that continues to disrupt the NHS may only become apparent when people return to work on Monday, experts have warned.
"The NHS has well-established systems for trusts to support each other in situations like this, and we are grateful to staff who worked hard to ensure we could offer a joined-up response to patients from London and the surrounding areas". But computers and networks that didn't update their systems remained at risk.
Australia and New Zealand appeared to have escaped largely unscathed as they woke up for their first business day since a massive ransomware worm hit thousands of computer systems around the world, disrupting operations at hospitals, shops and schools.
After infecting the computers, the virus displayed messages demanding a payment of $300 in Bitcoin in exchange for the locked files.
Numerous hospitals across the country and all over Hampshire were affected by "ransomware" that encrypted data and did not allow access to the data until the user had paid 300 USA dollars' worth of the online cryptocurrency Bitcoin.
It is not known how the attack has affected GP surgeries, which are due to open as usual on Monday. Microsoft released a security update in March to protect against WannaCrypt but Windows XP was excluded from the patch.
However, Wainwright said Europol was working on the basis that the cyber-attack was carried out by criminals rather than terrorists, but noted that "remarkably few" payments had been made so far.