BOSTON (CBS/AP) — A massive snowstorm packing hurricane-force winds has knocked out power to hundreds of thousands of customers in Massachusetts and has shuttered a nuclear power plant.

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The Pilgrim Nuclear Power Plant in Plymouth shut down after losing off-site power. Authorities say there’s no threat to public safety.

Pilgrim automatically shut down after losing offsite power at 9:17 p.m. on Friday. The plant’s diesel generators are currently supplying power to plant equipment.

The U.S. Nuclear Regulatory Commission is monitoring the power plant.