At least 12 women were injured when a balcony collapsed at a resort.
CCTV footage shows how the public health volunteers go up a staircase and congregate on the terrace.
As they look over the balustrade, some of the floor suddenly gives way, sending them plunging out of view.
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The horror unfolded as the hospital workers attended a seminar at the resort in Hang Dong District, Chiang Mai Province, Thailand.
The injured told local media how everything happened very quickly and everyone fell on top of each other.
They were left crying in pain as they waited for help to arrive on Sunday (4 Feb) morning.
Paramedics were dispatched to the scene and took the injured to nearby hospitals.
Two women were severely injured.
One broke her right leg and the second injured her head.
Ten have reportedly since been discharged after receiving treatment for minor injuries.
The police in Hang Dong District are investigating the case.
They have already said that the building was constructed lawfully but the balcony was added later without permission.
Local media say the second-floor balcony had only been erected recently.
According to local media, the owner of the resort faces charges of unlawfully modifying a building.
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