Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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Plaza Towers Elementary School was one of two schools flattened by Monday's deadly tornado in Oklahoma.
On Friday, officials from Moore public schools gave a press conference, where the principal from Plaza Towers gave an emotional account of the harrowing moment when the tornado struck her school.
"People were quiet, people were screaming," said Amy Simpson, choking back tears. "At that point, I believe that's the only time that I yelled, and I said, 'In God's name, go away.'"
Imagine that with a few keystrokes by a foreign enemy armed with nothing more than a laptop, an American city is suddenly plunged into darkness. Air traffic controllers watch their radar screens go black. A critical banking system is taken down, causing a financial crisis. Hospitals cannot operate. Clean water is no longer available.
With the looming specter of cyber warfare, that is the kind of threat the United States faces from enemies abroad, according to warnings from top intelligence and military officials.
It is the kind of thing that keeps former Secretary of Defense Leon Panetta awake at night:
"The collective results of theses kinds of attacks could be a cyber Pearl Harbor. An attack that would cause physical destruction and the loss of life," Panetta said in October 2012.
On Friday, The Wall Street Journal reported that Iran hacked U.S. oil, gas, and power companies. The hackers are far enough inside, that people are starting to get really worried.
"Power grids, electricity, communications, transportation - the critical infrastructure that lets us to do our day-to-day jobs, it's all run by computers." said Shawn Henry, former executive assistant director of the FBI.