Mass killing database: Revealing trends, details and anguish of every US event since 2006 March 1, 2023 How many mass killings are there in the US? High profile public shootings are only a portion of the nation’s mass killings since 2006, analysis shows. http://rssfeeds.usatoday.com/~/706828248/0/usatoday-newstopstories~Mass-killing-database-Revealing-trends-details-and-anguish-of-every-US-event-since/