On Sunday, at least 26 people were killed and several others were injured when a man approached the First Baptist Church in Sutherland Springs, Texas, and started shooting.

The incident marked the 307th mass shooting in 2017, according to the nonprofit Gun Violence Archive, which tracks shootings in the US. To put this into perspective, we are 310 days into the year, which means the US has had nearly as many mass shootings as days in 2017.

Americans are more likely to die from gun violence than many leading causes of death combined, with some 11,000 people in the US killed in firearm assaults each year.

There is no broadly accepted definition of a mass shooting. Gun Violence Archive defines a mass shooting as a single incident in which four or more people, not including the shooter, are "shot and/or killed" at "the same general time and location."

The government also doesn't have an official definition. In 2013, a report from the Congressional Research Service, known as Congress's think tank, described mass shootings as those in which shooters "select victims somewhat indiscriminately" and kill four or more people — a higher bar than Gun Violence Archive's, as it doesn't take injuries into account.

Texas church shooting Show all 9 1 /9 Texas church shooting Texas church shooting The site of the mass shooting at First Baptist Church in Sutherland Springs, Texas Reuters Texas church shooting First responders are at the scene of shooting at the First Baptist Church Reuters Texas church shooting Enrique and Gabby Garcia watch investigators at the scene of the mass shooting AP Texas church shooting Law enforcement officials investigate the scene at the First Baptist Church in Sutherland Springs, Texas Reuters Texas church shooting Carrie Matula embraces a woman after a fatal shooting at the First Baptist Church in Sutherland Springs Associated Press Texas church shooting Law enforcement officials gather near the First Baptist Church Getty Images Texas church shooting Community members come together for a candlelight vigil for the victims of the deadly church shooting in Sutherland Springs Laura Skelding/AP Texas church shooting Mourners participate in the candlelight vigil held for the victims Jay Janner/Austin American-Statesman via AP Texas church shooting A vehicle is hauled onto a flatbed truck where the suspect in a deadly church shooting was found dead in Guadalupe County William Luther/Austin American-Statesman via AP

In 2013, a federal mandate lowered that threshold to three deaths. By this definition, using data from Gun Violence Archive, the Las Vegas event was the 38th mass shooting in the US in 2017.

Data from Gun Violence Archive also shows that more than 13,000 people have died from gun-related violence so far this year and more than 26,900 others were injured.

There have been seven classifiable incidents since last Friday, giving an idea of the scale of the tragedy (Business Insider)

Here's a complete list of the mass shootings — as defined by Gun Violence Archive — that have occurred in the US so far in 2017.