至少389起！枪击暴力成美国“流行病”

Group 1 - The core issue highlighted is the increasing prevalence of gun violence in the United States, particularly affecting youth and educational institutions [3][5]. - A recent shooting incident at Brown University resulted in at least 2 deaths and 9 injuries, reflecting a broader trend of gun violence in schools [3][4]. - The "Gun Violence Archive" reports that there have been at least 389 mass shooting incidents in the U.S. this year, indicating a significant rise in such events [2][4]. Group 2 - Over 13,900 deaths and more than 25,000 injuries due to gun violence have been recorded in the U.S. this year, underscoring the severity of the issue [5]. - The number of mass shooting incidents has doubled from 2013 to 2022, with gun violence being described as an "epidemic" affecting public health and safety [5].