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A newly-released surveillance video shows a Florida police officer outside a high school while a gunman was firing on students inside. 

In the 27-minute video, Broward County Deputy Scot Peterson is seen outside the building while the massacre was unfolding inside, leaving 17 people dead.

Phil Keating reported the details on "Outnumbered Overtime" Thursday. Peterson - dubbed the "coward of Broward" since the massacre - can be seen standing with his gun drawn next to a civilian security monitor, but he never enters the school. 

He retired last month after Broward Sheriff Scott Israel said an internal investigation had been opened to examine why Peterson did not enter the school to engage the killer.

"The video speaks for itself," the Broward Sheriff’s Office said in a statement. "His actions were enough to warrant an internal affairs investigation, as requested by Sheriff Scott Israel on Feb. 21. After being suspended without pay, Peterson chose to resign and immediately retired rather than face possible termination."

Peterson, through his attorney, has pushed back on accusations that he acted cowardly, insisting he did not know where the shots were coming from and thought the shooter was outside, so he took cover. 

Watch an extended video here.

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