LONDON, May 13 (Reuters) - The British government does not yet know who was behind Friday's global cyber attack that disrupted the UK's health system, interior minister Amber Rudd said on Saturday.
"We're not able to tell you who's behind the attack. That work is still ongoing," she told BBC radio.
She said Britain's National Cyber Security Centre was working with the country's health service to ensure the attack was contained and limited, while the National Crime Agency was working with them to find out where it came from.
Rudd said the government did not know if the attack was directed by a foreign government.
On Friday, cyber extortionists tricked victims into opening malicious malware attachments to spam emails that appeared to contain invoices, job offers, security warnings and other legitimate files. Nearly 100 countries were impacted.
Reporting by James Davey; Editing by Mark Potter