2021 Has Had At Least 147 Mass Shootings

In 2021, there have been over 100 mass shootings by April. The Gun Violence Archive defines a mass shooting as an event with four or more victims. Recent incidents include the Atlanta shooting, where a gunman killed eight people, mostly Asian, at massage businesses. Shortly after, a shooter killed 10 people at a Boulder supermarket, and another incident in Orange, CA, resulted in four deaths and one critical injury at an office building.

How many people were killed in the Boulder supermarket shooting?

What happened at the office building mentioned in the text?