The recent upturn in U.S. homicide rates may have resulted from increases in the number of serious violent incidents, growth in the percentage involving firearms, or increases in lethality. Data from the National Crime Victimization Survey (NCVS) and Supplementary Homicide Reports (SHR) suggest that the national homicide increase was not driven by increases in serious violence or the proportion of these crimes involving firearms, but may be related to a longer-term increase in lethality. In St. Louis, the increase was concentrated in communities that previously had the highest violence rates, but changes in the structural conditions and population composition were unrelated to the upsurge in homicide.

中文翻译：

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严重暴力，枪支受害和凶杀的国家和地方趋势

美国最近的凶杀率上升可能是由于严重暴力事件的数量增加，涉及枪支的百分比增加或致死率增加所致。来自国家犯罪受害者调查（NCVS）和补充杀人报告（SHR）的数据表明，国家杀人案的增加并非由严重暴力行为的增加或这些涉及枪支的犯罪的比例所驱动，而可能与长期的增加有关致命。在圣路易斯，暴力的增加主要集中在以前暴力事件发生率最高的社区，但结构条件和人口构成的变化与凶杀案的激增无关。