The collapse of an under-construction railway bridge over a major river in China has killed at least 12 workers and left four others missing, state media reports said. Hundreds of emergency responders were deployed to the site of the collapsed bridge under construction in Qinghai, in northwest China, on Friday, to conduct rescue operations. Drone footage shows the middle section of the bridge torn off and hanging over the water, with dozens of emergency vehicles mobilised to the scene. CCTV cameras also captured the moment the bridge collapsed.