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On Wednesday, surveillance footage captured the moment that a 10-meter-high section of scaffolding, which was carrying three workers, suddenly toppled down in Mianyang city in southwest China’s Sichuan Province.

Seconds after the collapse, some passersby ran to the scene to rescue the workers trapped underneath. More than 20 people eventually joined in to help with the rescue effort. These amateur “firefighters” wasted no time, as some called an ambulance while others looked for tools that could help. They worked together and successfully rescued the three workers. Doctor said that luckily they all have stable vital signs, but one of them was severely injured.