Rescuers in Yuzhong County of Lanzhou City, northwest China's Gansu Province, are using drones, life detectors and sniffer dogs to search for missing people after torrential rain triggered flash floods and mudslides on August 7. The disaster has killed 15, left 28 missing and injured 15, with nearly 10,000 evacuated. Key searches focus on buildings destroyed by floodwaters, using aeromagnetic drones to scan for metal structures where survivors may be trapped, along with devices that detect weak life signals.