Action Fraud has received an increased volume of reports over the last 48 hours from organisations that have been affected by DDoS attacks

A denial of service (DoS) attack occurs when users are denied access to computer services (or resources), usually by overloading the service with requests.

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An attack becomes a ‘distributed denial of service’ (DDoS), when it comes from multiple devices. This is the most common form of DoS attack on websites. However, attacks on any type of system including industrial control systems which support critical processes – can result in a denial of service.