The United States has already seen 200 mass shootings this year. That includes three mass shootings from this weekend.
On Saturday, a gunman attacked shoppers and workers at a supermarket in Buffalo, New York, killing 10 people and wounding three others.
One person was killed, and four others critically injured at a shooting at a church in Laguna Woods, California.
And in Houston, Texas, authorities say two people were killed, and three hospitalized after a shooting at a busy flea market.
This data comes from the Gun Violence Archive, an independent data collection organization, defines a mass shooting as an incident that includes four or more victims, either injured or killed.