Zurich police on Monday were investigating a weekend incident in which a drone scattered banknotes over a crowd that had been drawn to an open area through social media. The ensuing crush resulted in serious injury to a 12-year-old boy. A Zurich police spokesman said that the person behind the event, which took place on Saturday, was known to them and was a well-known personality. Media reports said that a person with a public profile on the Tiktok video platform had pre-announced the event, drawing people to the open area. Banknotes to the value of more than €20,000 ($21,500) were to be relea…