A helicopter ferrying a donor heart to a Los Angeles hospital crashed atop the facility.
Dramatic video captures the moment the chopper starts spinning out of control as it is about to touch down on the helipad.
“Hey! Oh my God, oh my God, oh my God,” a witness below the building can be heard shouting as the helicopter is filmed crash-landing on its side on the rooftop and debris begins flying.
Miraculously, none of the three people onboard were seriously injured and the donor heart was able to be saved – despite a member of staff dropping it.
The eight-seater private helicopter which had travelled from San Diego to deliver the precious quarry, crash-landed on the helipad of the Keck Hospital of the University of Southern California on Friday afternoon.
According to reports, the chopper had to be prised open with the jaws of life so emergency crews could rescue the donor heart inside.
But in Sky 5 footage, a medical worker can be seen tripping and dropping the heart on the ground as they walk away from the wreckage.
Just hours after the crash, the heart was successfully transplanted into a patient, a spokeswoman for the hospital told media.
KTLA-TV reports the helicopter’s blades were destroyed in the impact, which was felt by medics working in the depths of the multi-storey building.
A surgeon told the TV station he felt a “jolt” as the chopper smashed onto the rooftop.
Javier Chamorro, 59, was waiting outside to pick up his son from the hospital when the helicopter crashed, he told the Los Angeles Times reports.
He said: “The building shook. I thought it was an earthquake.”
In footage of the aftermath, the pilot can be seen being stretchered away from the chopper’s wreckage.
LAFD said on Friday afternoon: “The aircraft is stable on its side, on the helipad. There does not appear to be a significant fuel leak.”
National Transportation Safety Board officials are reportedly investigating the cause of the crash.
Hospital staff were relieved the heart could be saved and transplanting into its recipient, despite the drama.
Keck Hospital spokeswoman Meg Aldrich told the Times: “It’s actually an amazing story.”