6 ways authorities failed Parkland: 'I don’t think there's ever been a more preventable shooting\

Another bombshell in a stunning series of law enforcement failures

An armed officer stood by at the Parkland Florida school shooting and did “nothing” while 17 people were slaughtered, reported Broward County Sheriff Scott Israel on Thursday. Deputy Scot Peterson resigned after a surveillance video surfaced, which showed him standing outside Marjory Stoneman Douglas High School for nearly four minutes during the six-minute massacre.

JUST IN: Broward County Sheriff Scott Israel says Marjory Stoneman Douglas High School resource officer "never went in" to freshman building amid deadly Parkland shooting; "He should have went in. Addressed the killer. Killed the killer."

— CBS News (@CBSNews) February 22, 2018

And this is just the latest in a growing list of failures and missed signs that could have stopped the school shooter before he ever had the chance to take 17 lives.

Here’s what we’ve learned so far

• The Miami Herald reported that the Broward County Sheriff’s Office was tipped off in November that the Parkland shooter “could be a school shooter in the making” but apparently deputies failed to even write up a report.

• Two weeks prior to that tip being called in, a relative of the shooter told police “they should seize his weapons.”

• Two years earlier, a deputy investigated a report that the shooter “planned to shoot up the school.” The information was sent to the school’s resource office but no action followed.

• The FBI was warned - twice - specifically about the shooter.

• According to a CNN report, Broward County Sheriff’s deputies were called to the home of the Parkland shooter at least 39 times since 2010.

• And now we know that an armed officer stood by during the shooting and did nothing.

“I don’t know that there has ever been a more preventable shooting that this one,” said Pat on today's show. "When you sit and think of the 17 people who could be alive today, it really hurts. It's agonizing."

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