A new report from the U.S. Secret Service analyzes 173 mass attacks that took place in the country from 2016-2020. It comes just days after two shootings in California – in Monterey Park and Half Moon Bay – killed 18 people. Shown here is a mourner at a candlelight vigil for victims of the mass shooting at a dance studio in Monterey Park, Calif. (VCG via Getty Images)
