Gremlins Strike San Francisco, New York City, and Los Angeles?

News reports are indicating that power outages have struck San Francisco, New York City and Los Angeles. The most serious appears to be San Francisco, where outages hit the financial district, affecting over 90,000 people, and shut down the city's transit system. The outages in New York City, per the reports, appear to have been limited to certain subway lines. Outages in Los Angeles hit LAX and other spots around the city.

Sources:

• "Massive power outage hits San Francisco leaving almost 100,000 without power, residents trapped in elevators and traffic chaos throughout the city"--Daily Mail.
• "Power Outages Coincide in LA, New York, and San Francisco"--Inverse. 
• "Major Power Outages In New York City, San Francisco Come Amid Worries About Failing Infrastructure"--CBS.

While no cause has been established, there is speculation that it was sabotage, perhaps a cyber-attack. Of course, this is not the first such attack on electrical infrastructure in the Bay Area. I've written before about attacks on electrical substations in and around San Francisco:

• "America's Achilles Heel--Electrical Transformers"
• "Who Was Behind Transformer Attack?"
• "Sheriff Releases Security Camera Photos of Attack on Substation"

There have been other attacks on power and communication infrastructure around the country:

• "Other Transformer Attacks and Vandalism"
• " 'FBI baffled over wave of nighttime fiber-optic cable vandalism' "
• "2nd Power Station Attack?"
• "Sabotage of Electric Lines in Arkansas"

And there were mysterious power outages to the San Francisco BART system in spring 2016 (see here and here).