(Bloomberg) -- Days after the global cyber attack, U.K. police are trying to figure out whether it was an established network of criminals, state-backed hackers or bored teenagers that crippled the country’s health service.

The malware campaign affected more than 200,000 computers in at least 150 countries, locking users out of systems at Chinese government agencies, Deutsche Bahn, automakers Nissan Motor Co. and Renault, logistics giant FedEx Corp., and hospitals around the world. As security experts gain the upper hand in containing the infection, police have begun the hunt for its creators.

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