On Monday, the Japanese electronics maker Hitachi, a prominent Korean theater chain and the Chinese government said their systems had been affected.
Officials struggled to explain why some NHS computers had not been "patched" with Microsoft updates to close the vulnerability that allowed the worm to spread across its networks.
Caldicott recommended IT systems be replaced as "a matter of urgency" and that health organizations "provide evidence they are taking steps to improve cyber security".
Prime Minister Theresa May said "warnings were given to hospital trusts" about the Microsoft vulnerability exploited by the attackers.
Russia, Ukraine, India and Taiwan were the most seriously affected countries, according to cyber security company Kaspersky Lab.
As computer experts frantically fight an global cyber attack, people turning on their computers for the start of the work week are vulnerable.
Ms Rudd said the National Crime Agency (NCA) and the National Cyber Security Centre (NCSC) were now part of an "international manhunt" to find the perpetrators.
Elliott wants a review of BHP petroleum
The fund owned 4,669 shares of the mining company's stock after buying an additional 519 shares during the period. Citigroup Inc reissued a buy rating on shares of BHP Billiton plc in a research note on Tuesday, April 11th.
A 22-year old British security researcher accidentally shut down the malware from spreading to networks in the United States of America when he bought the malware's kill switch domain which wasn't registered yet. In a blog post late Sunday, Microsoft President Brad Smith appeared to tacitly acknowledge what researchers had already widely concluded: The ransomware attack leveraged a hacking tool, built by the U.S. National Security Agency, that leaked online in April.
"We've never seen anything like this", he said.
What should I do if my computer has been infected?
The "real key" was whether trusts had regularly backed up data and whether they were installing security patches.
Tim Stevens, a lecturer in global security at King's College London, warned that the incident should be a wakeup call to both the public and private sectors to incorporate security into computer systems from the ground up, rather than as an afterthought.
Radiology services at the Basingstoke and North Hampshire Hospital were affected in Friday's attack by computer hackers.
Queen Alexandra Hospital in Portsmouth was unaffected by the attack.
Protests before travel ban hearing in Seattle
When the original travel ban was first issued, it temporarily halted the entry of people from seven Muslim majority countries. Human rights advocates have argued that the order still violates the Constitution because it discriminates against Muslims.
How to prevent a #ransomware attack?
The order came as West End bosses representing stores such as Selfridges and John Lewis today asked for an urgent summit with police experts on how to protect themselves from a new attack.
"If a system supports some kind of critical processes those systems typically are very hard to patch".
The hackers remain undetected but are believed to have so far gathered $42,000 in ransom payments from about 110 victims. No major Indian corporations reported disruptions to operations.
The ransomware that has locked up hundreds of thousands of computers in more than 150 countries has been mainly spread by e-mail, hitting factories, hospitals, shops and schools worldwide, the Financial Times reported.
Every British government department's computer system is vulnerable, the former head of the civil service, Sir Bob Kerslake, says.
Artist projects words 'pay Trump bribes here' onto DC hotel
Bell says he enjoys doing these guerrilla projects since they can transform a random government building into a wild conversation piece.
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