(Bloomberg) -- A cyberattack similar to WannaCry entered its second day, hitting businesses, port operators and government systems across the globe, with companies struggling to retake control of their networks.

A.P. Moller-Maersk A/S shut down systems across its operations to contain the cyberattack against its computer network, as it assesses the full impact. BNP Paribas SA’s non-banking Real Estate unit was also hit, while a number of WPP Plc companies continue to be affected by the cyberattack, Chief Executive Officer Martin Sorrell and John Seifert, CEO of the ad giant’s Ogilvy & Mather unit, said in memo to staff.

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