Murder rates saw a “historic” increase in 2020 compared to 2019, with more than 1,200 additional killings year-over-year in a sample of 34 American cities, according to a study released Monday.

Murder rates saw a “historic” increase in 2020 compared to 2019, with more than 1,200 additional killings year-over-year in a sample of 34 American cities, according to a study released Monday.