Updated May 15, 2017 3:31 a.m. ET
The cyberattack that spread around the globe over the weekend, hitting businesses, hospitals and government agencies in at least 150 countries, infected more computers as users returned to work early Monday.
Investigators launched a far-reaching hunt for the perpetrator, as institutions around the world worked to mitigate damage from the highest-profile computer-worm outbreak in nearly a decade.
Europe’s police-coordination agency estimated at least 200,000 individual terminals had fallen victim to the attack, while Chinese authorities put the number as high as 1 million world-wide.
The fallout in the early hours of Monday morning…
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