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Ministry of Health officials have been briefed by police about the ransomware attacks.

According to The Times, YouTube has since taken action to remove some videos and channels.

Who was/were responsible for this attack?

"We have stopped this one, but there will be another one coming and it will not be stoppable by us".

HOSPITAL chiefs failed to adequately invest in computer security despite a wave of attempted cyber attacks on Scottish health boards, an expert warned last night.

The UK government was repeatedly warned about the risks of attack, but failed to heed the advice.

The worldwide effort to extort cash from computer users is so unprecedented in its nature - the first widely successful example of ransomware that self-replicates like a virus - that Microsoft quickly changed its policy, announcing free security patches to fix this vulnerability in the older Windows systems still used by millions of individuals and smaller businesses. Europol, the European Union's police agency, said the onslaught was at "an unprecedented level and will require a complex global investigation to identify the culprits".

The U.K. and Russian Federation are among the worst-hit countries from Friday's cyberattack that continues to escalate throughout the world, according to EU Agency for Law Enforcement Cooperation (Europol) director on Sunday.

"People going back to work on Monday may switch on their computers and see their systems have been impacted", he said.

"It's an global attack and a number of countries and organisations have been affected", British Prime Minister Theresa May said.

WannaCry exploited a vulnerability to spread itself across networks, a rare and powerful feature that caused infections to surge Friday.

A security update - or patch - was released by Microsoft in March to protect against the virus, but it appears many NHS organisations had not applied it or were using an older version of the operating system no longer supported - namely Windows XP. The group claimed it was stolen from a repository of National Security Agency hacking tools. This is above world trends; 42 per cent of respondents in the region said they had suffered high or medium level damage to their reputation as a result of cyber-attacks, compared to 30 per cent globally. Microsoft said it had released Windows updates to defend against the ransomware used in the attack, but not everyone installed them.

Aruna Sundararajan, secretary, ministry of electronics and information technology (MeitY), said the government had initiated contact with relevant stakeholders in public and private sector to patch systems as prescribed in the advisory issued by the Indian Computer Emergency Response Team (CERT-In).

Cyber extortionists tricked victims into opening malicious malware attachments to spam emails that seemed to contain invoices, job offers, security warnings and other seemingly legitimate files. Other services soon went down, and then, the unidentified NHS worker says, a "bitcoin virus pop-up message" started taking over computer screens.

The ransomware's progress has been halted by the accidental discovery late Friday of a "kill switch" hidden within the code by a security researcher, said cybersecurity consultant David Kennedy, formerly of the US National Security Agency.

Symantec researcher Vikram Thakur said that total fix costs are likely to be in the tens of millions of dollars.

He said the situation at the plant, which employs 7,000, continued to be monitored.

French carmaker Renault was forced to stop production at sites in France, Slovenia and Romania, while FedEx said it was "implementing remediation steps as quickly as possible".

At least 48 National Health Service organisations were affected by the hack, including St. Bartholomew's Hospital, and the East and North Hertfordshire Trust.

G7 finance ministers meeting in Italy vowed to unite against cyber crime, as it represented a growing threat to their economies and should be tackled as a priority.