When we think about threats to America's energy infrastructure, we usually think about hackers. Hackers, or maybe, somebody taking a bomb to a nuclear power plant.

What we don't usually think about is some guys with guns.

According to a Wall Street Journal report by Rebecca Smith, last April a group of snipers cut the phone lines and internet access near a major electrical substation in San Jose, California, and then fired on the substation for 19 minutes, knocking out 17 transformers.

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