LONDON—British intelligence officials believe that a group linked to North Korea perpetrated last month’s massive cyberattack, which crippled computer networks at British hospitals and other organizations around the world, a person familiar with the investigation said Friday.

South Korea and some major cybersecurity firms have previously concluded the attack was perpetrated by the North Korean hacking group, dubbed “Lazarus,” which had previously been implicated in the 2014 hacking of Sony Entertainment. Most other governments, including British officials, haven’t publicly commented on any conclusions about who they believe was responsible for the attack.

Read: WannaCry attack hits Renault, 200,000-plus victims

South Korean officials believe the Lazarus group is part of North Korea’s cyber-attacking operation. North Korea has denied involvement in the Sony hacking and last month’s attack.

May’s cyberattack used a worm called WannaCry, which locked hundreds of thousands of computers around the world and demanded payment to unlock them. The attack hit dozens of Britain’s National Health Service organizations, including hospitals.

An expanded version of this report appears on WSJ.com.

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