A major power outage struck simultaneously across dozens of cities in the eastern United States and Canada late Thursday afternoon.

Cities affected included New York; Cleveland, Ohio; Detroit, Michigan; Toronto and Ottawa, Canada.

In just three minutes, starting at 4:10 p.m., 21 power plants shut down, according to Genscape, a company that monitors the output of power plants.

It was unclear what caused the outage, although officials said it was not terrorism...

At least batteries still work...