A graphic animation has been made to show investigators the who, what, when and where of the Parkland School shooting that left 17 dead at Marjory Stoneman Douglas High School on Feb. 14.
The video, played Tuesday for a panel appointed to investigate "system failures" of the mass shooting, was put together by members of the Broward Sheriff's Office by using information obtained from security video footage reviews and interviews with witnesses, The Sun-Sentinel reported.
The short clip, which portrayed Cruz as a black dot, tracked his movements as he made his way through the halls of the school, opening fire.
In the video, green dots were used to represent students and blue dots for staffers, but the color of the dots changed as each person was shot, with purple symbolizing those who were killed, and yellow for those injured.
Victims were all shot on the first and third floors and not the second floor.
Gualtieri said this was likely because there was no warning for victims on the first floor, while victims on the third floor were more vulnerable because they may not have heard the shots fired and, when the building's fire alarm was activated, they treated it like a fire drill.
The chilling footage was distressing for many to watch.
"I knew which dot was my daughter so it was pretty brutal for me," said Andrew Pollack, whose 18-year-old daughter, Meadow, was murdered, per the Sun-Sentinel.
Pollack forms part of the 16-member commission that was assembled to examine the tragic events that unfolded that day in order to make recommendations for changes.
The commission's chairman, Pinellas County Sheriff Bob Gualtieri, said Tuesday that the goal was to prevent any more mass shootings from occurring.
"Nobody else should have to endure what those children had to endure that day," he said, according to CBS News.
The commission's first meeting highlighted several discrepancies under review, including that emergency calls were not sent to a single agency, resulting in the overloading of police radio systems during the response, as well as the fact that teachers were unable to lock their classroom doors from the inside.
"The teacher had to go out into the hallway and take the key and try to lock the door. That's messed up no matter how you slice it," said Gualtieri, according to The New York Times, adding that there were "commanders that were going from car to car to car, from radio to radio to radio, trying to get on it."
He said there were some "hard questions that need to be answered."
Tuesday's meeting also revealed that Cruz planned his attack based on information on the 1999 shooting at Columbine High School that left 13 dead in Colorado, The Sun-Sentinel said.
"He mapped it out, he had been planning this for a while," said Gualtieri.
The commission has been tasked with creating a timeline of the Parkland School shooting, the response as well as all other events related to the massacre, The Sun-Sentinel noted.
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