Nations grapple with massive cyberattack as more threats loom

LONDON — Teams of technicians worked around the clock Saturday to restore Britain’s crippled hospital network and secure the computers that run factories, banks, government agencies and transport systems in other nations after a global cyberattack.
The worldwide cyberextortion attack is so unprecedented that Microsoft quickly changed its policy, announcing security fixes available for free for the older Windows systems still used by millions of individuals and smaller businesses.
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