About 100 drones lost control and crashed into a building during a show in Southwest China's Chongqing Municipality on Monday night. According to a video and photos circulated on the internet, a large group of drones with flashing blue lights displayed abnormal actions during the performance.
About 100 drones lost control and crashed into a building due to a mainframe malfunction during a show in Southwest China’s Chongqing Municipality on Monday night: Local Sources
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A person familiar with the matter later disclosed that a crash in the mainframe control led to the incident, in which up to 100 drones lost control and malfunctioned. Although there were no injuries, the incident resulted in huge economic losses for the show designers.
Source- Global Times