At least one Australian firm hit by global cyber attack

"The governments of the world should treat this attack as a wake-up call", he said.

Around a fifth of NHS trusts were hit in the attack, forcing them to postpone operations and procedures over the weekend.

A divert remained in place for trauma, stroke and urgent heart attack treatment, where diagnostic services are required, at the Lister Hospital, part of East and North Hertfordshire NHS Trust (Midlands & East).

British defence minister Michael Fallon told the BBC the government under prime minister Theresa May was spending around 50 million pounds on improving the computer systems in the NHS after warning the service that it needed to reduce its exposure to "the weakest system, the Windows XP".

"Most have found ways of working around this but seven, including Barts in London, have asked for extra support".

There is concern that family doctors' surgeries could be struck on Monday when they open.

An NHS England spokesman described it is a "very complex emerging picture".

"People should continue to use the NHS wisely and remember that they can seek help and advice from a range of other sources, such as pharmacies and NHS 111".

The WannaCry ransomware attack, which was launched last Friday, had a relatively minimal impact on NHS Forth Valley with only three GP practices and one dental practice affected.

"I'm anxious about how the numbers will continue to grow when people go to work and turn their machines on Monday morning".

Ciaran Martin, chief executive of the National Cyber Security Centre (NCSC), warned there could be a fresh wave of victims on Monday.

The widescale attack involved ransomware, in which infiltrated computers are held hostage until a ransom is paid, in conjunction with "a worm functionality" that automatically spread the virus across global networks.

The minister also confirmed the attack did not affect any vital services in Australia, following reports that the ransomware hit British hospitals and health organizations, but said employers should "make sure" that all systems are "updated" to prevent future attacks.

"My hope is what it will lead to is more urgency and more focus from departmental and agency heads at the government level, from boardrooms at the business level and from individuals and families - of the need to make sure you're doing everything you can to keep yourselves cyber-secure".

Investigators are working to track down those responsiblefor the ransomware used on Friday, known as Wanna Decryptor orWannaCry.

Among those affected by the virus was Nissan UK, but the auto manufacturer said there had been no major impact.

It is understood its plant in Sunderland is not due to have another production shift until Sunday night.

  • Zachary Reyes