A massive Windows hack has swept through Europe, and is starting to reach the US

Since early Friday morning, reports have been coming in about a massive ransomware attack sweeping through Windows PCs in Europe. The National Health Service in England has had numerous hospitals and doctor's offices hit, and a number of private companies have reported a similar attack.
According to reports from some companies, systems in the US are starting to see the attack, and IT departments are urging employees to shut down any "non-essential" systems to avoid infection.
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