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Newly enhanced footage showing the aftermath of the 11 September attacks in New York has been shared online.
As the 17th anniversary of the horrendous attack approaches, the footage by Mark LaGanga, which has cleaned up visuals and audio, has been viewed almost 600,000 times and has attracted hundreds of comments from people who are heaping praise on the rescuers.
In the heart-breaking video, which is just under half an hour long, LaGanaga, who worked for CBS, shows emergency service personnel attempting to work while surrounded by dust and debris following the collapse of the Twin Towers.
Survivors can be seen being led from the area and into waiting ambulances, while in other scenes people can be seen being wheeled away on beds.
At one point, inside the main lobby of WTC 7, one rescuer (from the Secret Service) warns LaGanga to get out of the wreckage, warning him: "I think you should leave. Everybody else is gone. I hear the top of the building fell down."
Despite happening almost two decades ago, authorities in the US are still working to identify people who lost their lives in the incident.
Just last month, a 26-year-old man was identified as Scott Michael Johnson, using a piece of his jawbone. Johnson was working as a securities analyst for investment bank Keefe Bruyette and Woods, when tragedy struck.
According to experts, Johnson is the 1,642nd person to be formally identified as having been killed in the attack. There are around 1,100 people still believed to be unaccounted for. The team at the New York medical examiners office are now using high-spec DNA testing to help give closures to the families of those who are thought to have been killed.
Chief Medical Examiner Barbara Simpson said: "In 2001, we made a commitment to the families of victims that we would do whatever it takes, for as long as it takes, to identify their loved ones.
"This identification is the result of the tireless dedication of our staff to this ongoing mission."
Johnson's mother said that being told her son had died in the attack offered some 'finality'.
She said: "You get pulled right back into it and it also means there's a finality. Somehow, I always thought he would just walk up and say, 'Here I am. I had amnesia.'"
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