An unknown marathon runner who happened to be filming as she neared the finish line captured the explosion on her head camera that sent the exhausted athlete sprinting in the other direction.
The video, posted to YouTube by user ‘NekoAngel3Wolf,’ shows a woman nearing the finish line of the Boston Marathon, near Copley Square in the city’s Back Bay neighborhood.
The clip is just one of many terrifying videos taken by spectators on cell phones and other devices that capture the two explosions that left three people, including an eight-year-old boy, dead, and 183 injured.
Scroll down for videos. Warning: graphic content
Boston Marathon bombings: Runner's point of view
The daughter of an unknown marathon runner has posted her mother's headcam footage from the Boston marathon providing a chilling first-person look at the explosion
The bomb goes off only hundreds of feet in front of the mother, who didn't end up finishing the 26.2-mile race
Bloody aftermath of Boston bombings WARNING GRAPHIC CONTENT
Boston Marathon bombing caught on video WARNING GRAPHIC CONTENT
Obama on Boston bombings
In the video, around the 15-second mark, an almighty boom can be heard and the explosion goes off only hundreds of feet in front of her.
The YouTube user wrote about the clip: ‘This is a video my mom recorded of the explosion. We are so lucky we got out of there when we did.
‘My mom didn’t finish the race, but we are all safe and that’s what matters. My heart goes out to the victims.’
The two Boston Marathon explosions, and their horrifying aftermath, were captured on video as dozens of spectators filmed the finish line at the annual event.
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Three people were killed, including an eight-year-old child, and 183 injured in Monday's bombings.
Several remain in a critical condition and nine children were injured, with one of the youngest reported as a two-year-old child.
Massachusetts General Hospital said four patients at its hospital were undergoing leg amputations.
Footage from camera phones, trained on the finish line on Boylston Street, shows a huge, fiery blast ripping through barriers, throwing runners and spectators to the ground at 2:50pm (ET).
Clouds of smoke rose in the air and panes of glass are heard shattering.
Seconds later, another thunderous explosion is heard as people run in all directions screaming and yelling for help.
Bystanders tend to people injured after explosions at the Boston Marathon finish line yesterday; 183 people were injured and three people were killed in the blasts
Fear: Two race officials react seconds after the explosions went off - as hundreds of brave volunteers rushed to aid the injured
Help: Medical workers aid injured people near the finish line
Videos show police officers drawing their weapons and running towards the site of the blast.
Stands for spectators are torn away by police and bystanders as emergency crews, who had been on hand for runners, try to reach the injured.
The attacks took place on Patriots' Day, an annual holiday in Massachusetts.
Hotel owner Mark Hagopian told MailOnline last night of the carnage he had witnessed, 35 yards from the explosion.
Mr Hagopian said: 'It was chaos - blood and limbs everywhere. There was a man who had lost a leg, another had lost both.
'There were seven, eight, nine people lying on the ground. They appeared to be dead.
'Marathon runners were tearing off their shorts to use as tourniquets to help the injured.'
Mr Hagopian was inside the Charlesmark Hotel, on Boylston Street, when the first bomb went off. As he rushed outside, the second exploded.
A Boston police officer wheels an injured boy down Boylston Street as medical workers carry an injured man on a stretcher
An unidentified Boston Marathon runner leaves the course crying near Copley Square yesterday
'There was blood everywhere, along with severed limbs. It was just awful,' he said. 'The second bomb came about ten seconds after the first. People were knocked off their feet by the force of it.'
The hotel owner, 50, videotaped the aftermath, showing a man lying apparently unconscious on the pavement covered in blood. Another man can be seen tearing off his red T-shirt to use as a tourniquet as police officers rush to help.
One person is overheard saying: 'What happened, a bomb?'
Another man, wearing a David Beckham soccer shirt, is seen running around.
Mark and his guests gathered in a restaurant two blocks away waiting for police instructions.
Mr Hagopian’s mother Marcia Scott-Harrison, who was evacuated from nearby Commonwealth Avenue, said: 'Mark is in total shock but at least he wasn’t hit. His hotel is just yards from the finish line. A man sitting outside the hotel had his leg blown off. It is awful.
'I heard both explosions, then a dozen cops came running up Commonwealth Avenue. They were shouting for everyone to get off the street.
'There were young girls crying, I pulled three into my apartment building. It was chaos. No one knew what was happening.'
'BOSTON IS STRONG. BOSTON IS RESILIENT': STATEMENT FROM ATHLETIC ASSOCIATION DIRECTOR FOLLOWING BOMBINGS
Statement from Thomas Grilk, Executive Director of the Boston Athletic Association Tuesday, April 16, 2013
The Boston Athletic Association (B.A.A.) extends its deepest sympathies to all those who were affected by Monday's tragic events. Those who lost their lives and were injured are in our thoughts and prayers.
It is a sad day for the City of Boston, for the running community, and for all those who were here to enjoy the 117th running of the Boston Marathon. What was intended to be a day of joy and celebration quickly became a day in which running a marathon was of little importance.
We want to express our deepest gratitude to all of the B.A.A. medical personnel and volunteers and the City of Boston’s first responders who reacted so courageously to help save lives.
Special thanks to the loyal Boston Marathon community – over 8500 volunteers, 1000 medical personnel, the organizing committee, and hundreds of thousands along the race route – who make the experience what it is for all our runners, who are hurting today.
We would like to thank the countless people from around the world who have reached out to support us over the last 24 hours.
We are cooperating with the City of Boston, the Commonwealth of Massachusetts, and all federal law enforcement officials in the investigation and the effort to bring those responsible for this tragedy to justice, so we are limited in what information we can provide.
Boston is strong. Boston is resilient. Boston is our home.
And Boston has made us enormously proud in the past 24 hours. The Boston Marathon is a deeply held tradition – an integral part of the fabric and history of our community. We are committed to continuing that tradition with the running of the 118th Boston Marathon in 2014.
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