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| Six students died on the third floor outside of classrooms |
New footage from this year's deadly
school shooting in Parkland, Florida, shows officials were
"underprepared" and "overwhelmed", local media say.
The footage shows "58 minutes of chaos" on the campus, the Sun Sentinel says. Seventeen people died in the shooting in February, including 14 students.
"A gunman with an AR-15 fired the bullets, but a series of blunders, bad policies, sketchy training and poor leadership helped him succeed," the Sun Sentinel says, after it reconstructed events using surveillance footage and official reports.
Its investigation comes as a preliminary report into the shooting is set to be delivered to state officials on 1 January.
A draft version, from the Marjory Stoneman Douglas High School Public Safety Commission, was released earlier this month.
What does the new CCTV reveal?
The local news website uses footage from inside the school to explore, minute-by-minute, the events of 14 February.The shooting, one of the deadliest in US contemporary history, prompted national protests and walkouts by students over school safety. A former student of the school, Nikolas Cruz, has been charged over the attack.
The Sun Sentinel's timeline shows that despite the suspect entering the school campus with a rifle bag, several members of staff appear to fail to promptly report a Code Red - a measure that could have put school students into lockdown.