Local, state and federal authorities are looking into how the FBI and the Broward County Sheriff's Office responded to repeated warnings about Cruz's potential for carrying out a school shooting; whether multiple sheriff's deputies responding to the shooting remained outside the school, as officers from a nearby city have alleged; and the precise nature of all the interactions Cruz had with authorities.
Cruz was able to legally purchase the AR-15 rifle he used in the shooting, one year before.
"The video speaks for itself".
Peterson resigned from his post last month after he was suspended without pay.
Peterson can be seen circling back to the building, where he appears to wait outside while chaos unfolds inside for the remainder of the 27-minute video.
An arraignment hearing is set for 19-year-old Nikolas Cruz, whose attorneys say he will plead guilty to all charges if the death penalty is not pursued in the Marjory Stoneman Douglas High School massacre.
The state attorney for Broward County, Michael Satz, announced Tuesday that he had filed a notice of intent to seek the death penalty in the case against Cruz.
Days later, the Broward County Sheriff's Office released a record of 23 calls to Cruz's home over the past decade that reveals a series of increasingly violent incidents involving the youth. "By not telling the [officers that] shots were fired from the building, he made it sound like the shooter was out of the school", former Coral Springs Police Officer Tony Pustizzi told the Sun Sentinel.
Police and school officials had resisted the release, saying it was evidence in an active investigation.
SEC hits Elizabeth Holmes, Theranos with fraud charges
In the SEC's statement, a top agency officer also managed a dig at media attention that allowed Theranos to thrive for so long. Secretary of Defense Jim Mattis served on Theranos' board after learning about the products from George Schulz, a former U.S.
This video now confirms Peterson did not go into the 1200 building.
At various times over the next 26 minutes, people - ostensibly police, as they are not pixelated the way the children are - can be seen at the far corner of the building, behind a pillar in a corridor to the right of the frame and standing near the corridor from which the golf cart emerged.
Even President Trump criticized the officer's alleged inaction, saying he would have run into the school if he were in that same situation.
The clips only show the police response outside, not the horror that occurred within.
Greenleaf appears to leave the view.
No audio is on the video and the faces of students and other school staff members are blurred.
Phil Keating reported the details on "Outnumbered Overtime" Thursday.
WATCH the surveillance video in the media player above.