NHS hospitals across the country have been hit by a cyber attack.
The Independent reported that the hack is an example of ransomware, which only allows people to log back on to their computers when they have payed the hackers money.
The BBC claims hospitals in London, Blackburn, Nottingham, Cumbria and Hertfordshire have been affected.
The East and North Hertfordshire NHS Trust has confirmed it has been hit by the attack.
The trust has asked members of the public to stay away from A&E at the Lister Hospital in Stevenage and all activity that isn't urgent at the four hospitals has been postponed.
Some GP surgeries have also been hit in the attack and have asked patients to avoid calling unless absolutely necessary, as some phone lines are down, The Daily Mail said.
NHS England has said it is looking into the issue.
NHS Digital has released a statement on the matter, it says: "A number of NHS organisations have reported to NHS Digital that they have been affected by a ransomware attack which is affecting a number of different organisations.
"The investigation is at an early stage but we believe the malware variant is Wanna Decryptor.
"At this stage we do not have any evidence that patient data has been accessed. We will continue to work with affected organisations to confirm this.
"This attack was not specifically targeted at the NHS and is affecting organisations from across a range of sectors."